First of all, I generally despise trade talk because people mostly only want to trade guys that don't like and never want to trade good players. The concept of giving up something to get something is beyond most folks.
That said, my thinking is that the value of Smart, Crowder, and Bradley are roughly equal. Sure, some will quibble and say Smart is young and has upside and he is much more valuable. On the hand, there are plenty of people that think Smart is a future role player at best. Point being, his average probably fall around the same point as Crowder and Bradley.
So, if you could keep one of these guys, which would it be? For me, it's an easy decision. I'm keeping Avery. Unique, impactful, good shooter, developing other areas of his offense. Also the guys other teams hate to play against the most, which is cool.
And I know some will say depends on who is coming back but let's ignore that for the sake if this discussion.