But among them, the highest Array Level is only Liu Zheng's 80th level; indeed, he has not connected with a formation reaching the 99th level.
Generally speaking, even if a formation is intact and let others freely observe it, it still requires a lot of time before one can understand the principles of array setting.
Moreover, one needs to be a person exceptionally skilled in formation to do so.
Although Cao Zhen has never connected with a person of 90th Array Level, the issue is he has connected with three people proficient in formations. These three, Zhang Daoling, the Golden Light Sage, and Liu Zheng, each have their own distinct styles of setting formations.
Therefore, he can instead verify his understanding by reflecting on their insights into formations.
As he observed the formation before him, the more he looked, the more astonished he became.