(Assuming Hill signs and BBD goes)
It's not a starter backup thing. What we'll see is starters + rotation guys, then reserves/backups and projects.
Starters are obvious: KP, KG, PP, RA, RR
Rotation is set now: RW, GH, EH
House will play "point" with Hill in at the wing, and he also play some SG next to Rondo. Rondo is going to play 35-40 MPG next year. He becomes the one guy that can't go down. Hill will play SF off the bench, PP will slide to SG when they play together. Rasheed will get minutes on the floor with KP and KG.
So that's the 8 people who the season depends on. The next five guys are the emergency plan.
Swift, Scal, Walker, Giddens/Tony Allen, Pruitt/Lester
There's an outright competition for roster spots at the SG and PG. But between Swift and Scal one of them will get 5-10 minutes per game during rotations and the same is true for Walker/Giddens/Tony Allen.
One trade that would make a lot of sense is for the C's is Scal, Tony Allen, Pruitt for Darko. With some $ heading to cover a Scal buyout, but now that he's gone from the cash starved Griz to the cash flush Knicks, that's unlikely. I think any trade that moves Scal needs to bring back a big man who can be counted on, because I don't have faith in Swift (but I like him as a project slash foul giver against big guys.)
Given that Perk, KG, and Sheed all have some shortcomings in the post, I'd love to get a healthy Powe in the post for a postseason run. Being able to dump the ball down low and get some offense is a big luxury when the 3 pt shot doesn't fall.