I don't think we need to get Butler, I believe Durant would come without him. I think Bradley and Crowder are pull factors in their own right.
With Philly struggling to get the top PGs they may be more open to a Noel trade that has Rozier in it. If it costs Smart I dont think it's worth it. We don't have such a logjam in the backcourt that warrants trading for low value. I understand others feel differently but smart is better than Noel, he's also better cost controlled.
How about Noel for Rozier, RJ, Young, Clippers 2018 pick and the rights to Colten Iverson?
Then if we sign Durant we'd have
IT/Jackson/Thornton
Bradley/Smart
Durant/Crowder/Brown
Horford/Mickey/Bentil
Noel/Olynyk/Zizic