Marcus Smart isn't going anywhere without the exception for a great superstar in return...
A player that gets invited to USA 3 times in a row is no mere coincidence... You keep a player that a organization like USA has confidently announced their deepest respect, and utmost trust in.
The last person I'd give them is Smart, then Young, and Olynyk.
Also, I don't see Bird as the type to trade players like Hibbert for nothing less than what he thinks he should get, which is expiring, picks, and great young prospects.
I'm fine with running with Zeller, Fav, and Anthony. I'd like to see what Zeller/Fav can do in rotation, and see what they lack for us to make up through trades/FA.