According to Frank Zicarelli of the Toronto Sun, Jarret Jack is ready to assume captaincy of the team if asked now that Bosh is on his way to the land of hot suns and cool mojitos.
Personally I don't know if this is necessarily the right choice, but considering the alternatives are the Young Gunz, Hedon't, Bargs or Calderon, there aren't too many other guys who would be appropriate.

Do you guys think this is a good choice? Can he provide the leadership and mentality that this team so desperately needs? What does it say about Bosh if Jack is able to lead this team more effectively? Or get more out of the guys around him?

Should be an interesting situation to watch.

Source - http://www.torontosun.com/sports/bas.../14630716.html