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Metal, Earth, Wood, and Water? All four consecutively?
If others were to know how Cedric spent his most recent comprehension time rewards, they'd probably curse at his wastefulness.
Why do they consider it a waste? Because everybody knows that you can only focus on one concept law at a time, especially when you're trying to gain the acknowledgement of the Origin Laws.
This wasn't any rule; it's a given fact. Nobody was capable of juggling two concept laws at a time. It doesn't matter whether they have prior understanding of it or whatever.
You pick, stick to it, comprehend it until you complete its origin law diagram, and wait until you get the acknowledgment of the origin law. Only after that could you pursue other concept laws to the same level.
That's how it is, and everybody knows that.
