Starters on good contracts are exactly the assets you don't want if you're starting a rebuild. The most you can flip them for is late 1sts, and they won't be part of the next championship team. That's one reason I hated Jae for Cleveland in that deal: the Cavs weren't championship contenders without Kyrie, Jae had no room to make a leap, and his re-trade value was low.Saric and Covington are both starters on good contracts and Kawhi is a rental. I think that’s a good offer for a guy who wants to leave and in line with other comparable situations.
The Oladipo trade is a better template: take a guy who has big upside but hasn't hit it for whatever reason. I'd much much rather get Fultz than Saric/Covington in the Spurs' spot.