We know that the devs can tweak the game engine in mysterious ways - lol
(like the first demo of the game with a fix result or reducing the domination scores vs abandoned teams or the beat-ability vs Mourinho's team or at events games).
So a scenario is in the 3/4 official competitions they reduced the effect of individual skills (white-greys) but kept them in FA games or there the skills affect more because we have usually equal teams and background with present managers (I 'm talking about top100 - platinum) .
So if you go for this, keep pushing whites, if you 're going for official competitions and secondary the asso games, go for more balance.