Unfortunately, whoever Scal is replaced with -- Powe, Tony, or even Walker -- it's going to result in ball movement becoming more stifled. Hopefully, Doc continues to mix in starters with the bench to alleviate this a bit.
If I had my pick between Powe, Walker, or Tony, I'd definitely prefer Powe. He brings some tangible, NBA-ready skills, which is more than can be said for the other two right now (although I really like Walker for the future.)