Here was my rationale...
Roberts wasn't going to make my roster, but he had some handcuff value for UY.
Ariza and Wright help me solve my SG/SF position short term until Bullock/Rice/Ledo can develop.
Chandler hurt a little to part with, but Ariza and Wright each give me 90% of what he brings to the table.
Wright and Moultrie are useful bigs, but were on the outside of my rotation, and I don't see either emerging as reliable starters soon (maybe Moultrie, but Wright is in his 6th year and has deficiencies that limit his minutes).
Meanwhile, I think moving up in the 1st round of next year's draft plus an extra pick is worth more than the difference between say, Chandler and Ariza or Moultrie and Cunningham.
I dare say I saw it as a win-win for teams with different priorities.