I think that BBD and Powe miss Posey the most out of anyone.
I mentioned it another thread how the loss of Posey has resulted in a bench rotation where with Powe and BBD on the floor at the same time much more than last year. I believe that that is part of the reason that Powe and BBD have struggled. With Posey in the game Powe and BBD could concentrate on their strengths, Posey was a much more of an offensive threat reducing the pressure on either Powe or BBD.
Of all the off season moves I was most excited about Walker, I had hoped to see him play himself into significant minutes with the 2nd team. I was able to see Walker play for K-state a lot, and he has the potential to be a solid offensive option. He does have to develop some defense to go along with the offense, but playing with Powe or BBD (who both are above average defensive players) would seem to be a good fit.
If Walker can develop into the player that I had hoped by the end of the season it would ease some of the sting of losing Posey. I may be an optimist, but I still think it could happen. Obviously, I would love to have Posey back. I can not fathom why DA would take such a risk passing on a know commodity, relying on developing young talent to fill that hole.