It would be nice to build around Simmons or Ingram. But you probably have to trade IT and AB. Also if you do have Ingram shouldn't you make Crowder available? That is rough. So maybe it is best to trade the top 2 pick and all the 2nd round picks of 2016 for Cousins. You take the guy who is a top 10 player now because your team is already good. And like what happened with Ray Allen trade maybe then you can successfully pitch to Durant. If you get KD you end up with an elite 9 man rotation
Starters: IT, AB, KD, KO, Cousins
Top 4 bench: Smart, Crowder, Mickey, AJ
Clearly it's a offense starter group and defenders bench but you can switch things up. Maybe Smart starts and/or AJ?
Put that against Cavs current top 9
Irving, Shump, LeBron, Love, Thompson
Delle, Smith, Frye, Moz
Put that against Warriors current top 9
Curry, Thompson, Barnes, Green, Bogut
Iggie, Barbosa, Livingston, Speights
Raptors top 9
Lowry, DeRozan, Carrol, Scola, Val
Joseph, Ross, Powell, Biyombo
Spurs top 9
Parker, Green, Leonard, LA, TD
Mills, Gino, West, Diaw
So yeah I deal the top 2 pick for Cousins and just a shot at KD.