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.
I like the comparison to Fisher for Chalmers. I think that is very accurate. Both are tough, big PG's who aren't great passers, but are still good floor leaders, and can knock down big shots. I think Chalmers will probably have a similar career.
I think Chalmers and Pruitt have very similar cielings. Neither will be a star, but they both should be very solid players. I give Pruitt a little edge because I think he is quicker, and has a better shot, although Chalmers strength is also a big asset that Pruitt doesn't have.
Either way, it is close...but it comes down to the fact that Chalmers was not a big enough upgrade on Pruitt to give up on him (there is no way they would have kept both of them), and also to pass on Giddens, who could potentially be an upgrade over Allen.