He's 20, 20 year olds do impulsive, self indulgent things, I see no reason to believe this is something that will necessarily continue, or hold him back for that matter. I also don't believe that if the team tries to get him to tone down the cockiness that it takes his edge away, that's an entirely different thing altogether. He's not going to turn into some Punch and Judy just because a team doesn't want him to show opponents up, please.