I think of this a bit differently. I think we want to upgrade every position.
Every player is available for the "right" trade, but all of our guys are also upgrading themselves.
I mean, would you trade Bradley for a better 2-guard? Maybe. But he is also the best ball-hawk in the NBA. He hits big shots, and he is finally attacking the rim more to become a more well-rounded player. He is not done developing. I'm not sure he will ever be a great passer or ball-handler, but he is still rounding out his game.
What about Crowder? Sully? Olynyk? Smart? These guys haven't maxed out either.
I think Thomas could become an even more efficient shooter in another year in CBS system and with another scorer to play off of.
Turner, Johnson, Lee, Jerebko, and Zeller are maxed out as players (in my opinion).