They're over the cap, so Cousins would have to re-sign at a steep discount. And if that happens, it means Cousins wasn't very good when he eventually suits up this season (which I doubt will be the case).

If Durant leaves (which he won't), they're best shot at a superstar next season is packing a some of the young left-over non Steph, Klay, and Dray players for a trade with like Iggy's expiring deal.