It would be funny if he joins the Celtics. But his ego could really hurt the locker room next season as he already did with the Bulls.
I've never had an issue with Wade's ego. I don't feel his ego is nearly as bad as half the big name stars out there, and at least Wade has the portfolio to back it up:
* 3x NBA Champion
* 12x All-Star
* 2x All-Defensive 2nd team
* Career averages of 23 points, 6 assists, 5 rebounds, 1.6 steals, 0.9 blocks
We're talking about a surefire Hall of Famer, and unlike some greats (e.g. Lebron) nobody can every question Dwyane Wade's competiveness - he plays HARD every night and played with the same type of edge as Kobe and MJ. Wade played with two of the greatest players ever to play the game (Lebron and Shaq) and in both cases it was Wade who was the leader of those teams.
The only thing I don't like about wade is that he is sometimes bordering on TOO competitive - I do consider him a dirty player, and IMHO he will do whatever it takes to win, even his actions have a very high risk of causing injury to another player.
But as a veteran leader and competitor I'd love to have Wade on this team - I think adding him at the SG spot could (which is probably our weakest spot right now) puts us on par with the Cavs, maybe even above them. He's not the scorer or player he once was, but he can still fill it up on occasion and would be a perfect 3rd scorer for our team given that every other guy on our starting unit (Kyrie, Hayward, Morris, Horford) has the ability to stretch the floor - making Wade's lack of outside shooting a non factor.
I think he'd fit nicely in Brad's system too. Wade is a skilled passer with excellent basketball IQ who can play and guard three positions (1 through 3). He can score, defend (in stretches), rebound, pass, handle the ball - and he brings championship experience.