Here's the thing though. If our FO believes he's an all star and cornerstone player, (which, I'm dubious of), then you have to go get him. You can't let a guy you think had that sort of upside walk away.
I don't have that valuation on him, but he does have a rare upside that Sacramento rarely gets access too. They'd have to be right of course, but if you're going to swing, swing on a upside play like Kuminga.