Over the six decades I've been watching football from all over the globe, I have seen literally dozens of players with phenominal ball skills but, no football brain.
I have seen the opposite at least as many times as well, that is players without many, if any, ball skills but, an inbred knowledge of how to beat their opponents, how to hurt them by making a simple pass at the right time.
Every now and again a player comes along who has not only got those ball skills but, the footballing brain to go with it.
Grealish has potential, in that he has the ball skills but, at the moment lacks in the football brain department somewhat.
If the coaches we now have, can awaken his 'awareness' to what his team-mates are doing, especially in area's that will hurt the opposition, he could fulfill the potential he still has.
If that 'awareness' can't be woken quickly, then I am afraid Grealish will become just another might have been.