Even top - top players and football teams have compatability / settling in problems.

Every player had cetain attributes / skills / mental attitudes that ( if highly motivated ) can shine.....and dare I say - in the right system and given the right service - every player will impress.

Now that's where the manager comes into power.....a good manager knows how to "press the right buttons" - "play the right system" to suit certain games / players - horses for courses !

But it isn't an instant process / success unless your very fortunate because people are people and interact differently - man management / experience is the key factor. And a modicum of intelligence doesn't go amiss.