I think Chalmers will be a nice player in the NBA...but I think Pruitt will be a better player, and there wasn't room for both of them.
I'm very impressed with Chalmers and was very impressed with him at Kansas. He's easily capable of having a Derek Fisher like career next to Wade. Himself and Dwyane complement each other very nicely. Chalmers should start next season. He's the best point guard they have. Best ballhandler, best passer, best shooter, best floor general, best defender, best vision of their point guards (nice to have Banks around when you need him

).
I think Chalmers is going to be better player than Pruitt in the pros. Giddens like you said in the rest of your post, he's the wildcard, Giddens and Pruitt together possibly could work out as more than Chalmers by himself. It was fair enough to pick Giddens.