Pop is right. Most unskilled defensive specialists (McGee, Capela, Jordan, Gobert, Thompson, etc) at least know where to be on the court offensively to get easy baskets. That's not the case with Deadman. I mean, the guy can't even set a proper screen.
Spurs have bigger fishes to fry, and there's tons of Deadmans in the D League. Make a run at McGee.