There are some syntax errors in that you have a couple comma splices.
But I had a hard time finding the meaning. If they are going to be an incredible team of chess players but they are better at soccer (I would say "at soccer" rather than "in soccer") than they are at chess, they must be world-class soccer players to be better than "incredible."
If it's your job to get a chess team together, how can it not matter to you that they call themselves chess players?
What does their choice of milk or wine have to do with this? I'm just not picking up on the mood you're trying to create because it seems to be conflicting.
-- I'm not a teacher, but I'm a writer.