Okay so I missed the GK training episodes. Don't know anything about that.
in some old thread I read that earlier it couldn't be more than some specific difference (for e.g. 5 points deifference) among Attack, Defense, M&P attributes. So khris is this what you are saying then that would be the bestest ever solution along with stars of a player having sense w.r.t. any of his individual attributes. For eg - A 5 star player can have max 120% attribute and not more than that. If we want to increase any specific attribute then we have to increase his star. Also he can't have more than 20% difference among average Attack, Defence, m&p skills.