After returning to the village, Katsuro did not go back to his former position in the hospital - after all, Tsunade was doing more than enough there, revolutionising Iryo ninjutsu and its application with vigor, with Shizune aiding her. They tried it with the Senju clan, whose connection to their extreme vitality and chakra meant they were naturally quite good as medical Shinobi. Those with good chakra control were given lessons by Tsunade and Katsuro with good results, and from their own experience, the use of knowing Medical Jutsu on the field was immeasurable. With Katsuro's support, and his political weight, they also managed to implement experimental schemes with medical ninja in standard Shinobi squads and even some first aid and medical lessons in the academy's final year. It forced Katsuro to pay attention to the academy curriculum (with Kakashi also attending) and he noticed its quality had significantly deteriorated, even compared to his time there. For geniuses like Kakashi, it was a complete waste of time, with a bunch of nonsense about the Will of Fire and history which elevated the Third Hokage, calling him the strongest Hokage - an absolute joke to anyone with at least half a brain, and complete propaganda supposed to trick children and make them loyal, something Katsuro saw as a disgusting tactic.
Instead of his hospital duties, Katsuro spent his time with his clan. He made sure to give the Uzumaki their deserved seats as elders, while including them with the people he taught, and he would often spend time giving tips to shinobi of the clan, whether they were experienced Jonin or academy students, helping them with a Jutsus they were struggling with, or a seal he couldn't quite get. But, he was mainly teaching the 6 Uzumakis he had picked up in the Grass Village - after all, they were pretty much his disciples, and he couldn't have them embarrass him. Shizune would even join him sometimes under his insistence that even if she was a medical Ninja, she should be able to protect herself. Kushina would no longer really join him instead spending her time training with her genin team or doing missions. Even though her team leader was Jiraiya who had come back and Katsuro could trust, he made sure to let her know how he felt with mock sadness. Saying things about how a boy had stolen his little sister. Every time he would say these things or make some sort of comment Kushina became scared that Minato would die and she had to ensure Katsuro promised to stay at home.
Instead of Kushina lately even Kakashi would occasionally make an appearance, learning much more under Katsuro than in the academy. His expertise left the little mask-wearing kid to be left in awe at Katsuro's sheer versatility. Kakashi had not previously believed his Dad, when he said Katsuro was stronger than him - after all, Sakumo was his own son's hero. But his sessions with Katsuro were slowly changing that.
Katsuro had even opened his reserves of Jutsu much more to the clan, even extending it to the Uzumaki, who at this point were synonymous with the Senju. He allowed academy graduates to freely pick and learn 2 D Rank and 1 C Rank Jutsu from the clan's reserves - even helping them with it. Usually such treatment was exclusively for geniuses of other clans but Katsuro did so to ensure the strength of his people, and to make sure they wouldn't fall easily. And it wasn't just this, once they had Chunin level strength (as seen by other members of the clan or Katsuro himself, without needing to go through the hassles of promotion), they would receive the B Rank Shadow Clone, and 3 more Jutsu below the B Rank of their choice. Once these were mastered, the choice of one more B Rank Jutsu was also given.
This created a direct pathway for the Shinobi of his clan to quickly get stronger, with them being provided with the resources by the clan while Katsuro also encouraged teaching within the ranks. Often, the Jonin and Chunin teaching those younger or weaker than them would receive rewards in the form of a Jutsu as well. B Rank Jutsu were something even a typical Jonin would covet and wouldn't have many of, but the new system and the Senju clans own unmatchable vast reserve of Jutsu, meant this was not the case for them.
The ascension to Jonin level strength would bring the option of learning the Forbidden A Rank Jutsu: Multi Shadow Clone Jutsu, if their chakra amount was judged to be adequate, or another A Rank. If they did not choose an A Rank, they were instead allowed 3 other Jutsu below it. Even the Senju clan struggled somewhat with Jutsu of this level, but with Katsuro's own addition of his original Jutsus, the reservoir was fleshed out a bit more. Katsuro would even rarely hand out S rank techniques to those he believed would be able to use them effectively. If other people heard of this, they would be shocked at even the A Rank Jutsus being handed out - let alone S Ranks. Other clans, like the Sarutobi, would treat such Jutsus as their heirloom, protecting them with his life. But this reward system also meant that while working on himself, Katsuro would often create many Jutsus, by modifying existing ones or creating completely original ones.
He had even been working on a hand-signless Jutsu, recently, to be used with his Flying Raijinn after gaining some inspiration from the Bijuu Bomb the Tailed Beasts could form. Everytime he came up with something new and nonchalantly added it to the clan's reserves, Kaito would look at him in shock, but soon grew used to it, seeing Katsuro's lack of reaction.
Soon, using pressure with the alliances Katsuro had made, the clans were paid, including the Senju and Uzumaki - Hiruzen could not avoid such a public promise. It left Katsuro with huge amounts of money, even after dividing it and giving everyone their rewards. The Senju's contribution to the war was arguably the largest, even though they had arrived late. Katsuro alone, more than equaled a large clan, and their reward reflected this. He invested the money in expanding Senju businesses throughout the village and the Land of Fire: restaurants, hotels, stores and other businesses were opened and improved, and Katsuro employed the civilians of his clans to work there, and many of the Uzumaki who could no longer fight would make sealing tags, storage tags, explosive tags and more, which Katsuro would negotiate to be sold to stores or directly to other clans. This alone brought the Senju and Uzumaki a large monthly income even after giving everyone their own cut. The Uzumaki, being employed by the village to fix its barrier, also brought their own lump sum, while also enabling certain hidden additions to be placed by Katsuro who partook; ensuring a higher payment. These additions would be ones the village wouldn't realise afterall, the man who was called Professor was not all that good at Fuinjutsu. After the high initial set up cost, after a year they would be in the green and from then on it would be almost pure profit, ensuring longevity for a clan who was already rich.
But there was a slight blip in their peaceful times, Katsuro clearly understood Kushina had some feelings for this boy and as much as he joked he also wanted to know about him. He had yet to even meet him due to her objections after all. So Katsuro asked about him, liking what he had heard. Kushina painted an image of a perfect genius Shinobi who was kind and strong. While he was pleased, his instincts also told him something wasn't as it seemed. This genius boy, a civilian Ninja was assigned under Jiraiya, one of the Sannin. Katsuro made a guess.
Perhaps this is the successor the Third is grooming. A civilian shinobi, one with little backing. One he can control… This Minato, I will have to see him myself.
AN: If you would like to view up to 20 chapters ahead, and would also like to support me, please visit my P@TR30N, at pa tr eon.com / GhidorahWriter (remove the spaces). Thanks for reading and make sure ADD to your COLLECTION and VOTE with POWER STONES! The target is 350 POWER STONES for the next BONUSCHAPTER!