Think about this, OKC could send Westbrook and a 1st or multiple picks for Curry+filler, they won't have to worry about WB qualifying offer in 1 year and get a guy that would actually pass the ball to Durant and D12.
They get significantly under the cap if they don't excercise options to mullen,maynor. They would keep Harden of course and maybe Aldrich, and trade either Collison or Perkins.
If they kept Perkins imagine how intensive their practises would be going at each other and how huge Perkins would be off the bench, but I think Perkins will not be happy with 13-15 MPG behind Howard so he would likely be traded,they could use a scoring wing.