Buddy Hield doesn't grade out defensively very well at all. I obviously haven't seen a lot of Kings games, so I don't know how much his D value is reliant on his teammates, but he grades out pretty poorly. One of the things DDV does well is play solid D. I'm just not sure what you're trying to move DDV for. He's young, still (relatively) cheap, and plays pretty good D, and rebounds really well for a guard. We don't need a ton of buckets from him, so he's doing everything the Bucks need, and then some.