i:ve you had read it you can get a better idea how its works

if you learn the player a new position you unlock new skills en the game-engine automatic distribute them

But how the engine set his settings to perform the new position you must ask the developer of the engine

Maybe i has do with his foot (l/r/both) and his total skills in attacking passing crossing ect this way you can get amr/st or st/amr but that is what the game-engine decide

But maybe i am al wrong but this way i see it