Now you want to teach me how potential cap works? The best calculator of potential is made by me (Yellow Cake mentioned it in this thread).
Players are players, in Japan NT I will have worse players than in Poland NT and better than in my club. It's no problem for me.
I helped our U21 and skills of U21 players were different too. I set lineup in 5th division, in 4th division, in 3rd division, in 2nd division, in 1st division, and NT, and I helped to set lineup in U21 and B3.
So it is no problem for me to work with players with different skills and potentials.
How to fix Rakus to work for a domestic team, not an NT, lower his primaries. I would say just lower IS, about 4 or 5 clicks, salary goes down to about 150k. Raise JR, OD and PA....assuming its level 7 trainer single posotion from age 18 and started with like 60ish skillpoints....
Sorry, this quote indicates that you have no knowledge about NT. Primaries are important, we don't need players, who have all skills = 12-13. Salary = 230k is acceptable for competitive club (if it's acceptable in Poland it should be acceptable in Japan even more, because competition in Poland is harder).
Rakus wasn't trained by level 7 trainer he hadn't 60 skill points at beginning.