I think Hill mitigates the lack of playmaking PG off the bench. Sure Grant isn't going to run the point, but he's very comfortable and capable with the ball. With Sheed as an option on the post, or an outlet behind the 3pt line or as a screener, and Hill as another big target who can shoot or handle, the pressure on House and whoever Doc decides to play out of TA, JR, Walker and Scal is dramatically reduced.
House of course would still have a fair amount of handling responsibilities, but I think he's capable.