AA means All Age. (i.e. AA1 is the highest amateur level). We play 5 a side, no practice. For me this is extra practice for the full field.
The good player usually moves quickly back into a defensive position, I wouldn't say its cohesive though. It is more a cohesive unit with him off the field. The less good players often get caught out with the excitement of how fast he gets forward, then back and are really left in no-mans land for most of the game. I don't think in theory getting into positions to receive a pass is the problem, the lesser players can do that fine without the good player in the team, it is the good player insisting on playing a much faster pace than the lesser players can handle with their touch, thought speed and fitness.
When the good player's on the field the game often ends up being effectively a team of three with me, him and the goalkeeper.