A minor one, but it would raise a flag about ego and where the player thinks they are in their standing and understanding of the game. Do they honestly believe they are one of the most learned? If so will they listen to other players/coaches, or do they know better? Will they tune out if it is things they don't agree with?
Gotcha.
When I first read the quote, I didn't take it the way that you did, but more as him agreeing that he has a high command of the game when he's out there.
I'd agree with that take. If he meant how you took it then yeah, pretty major red flag.