If Kelly's ceiling is Bargs 2.0 that's ok for a late lotto pick. Even with his turrrrrrrible D.
Bargnani's biggest problem has always been Bryan Colangelo.
Kelly's rebounding TRB is a full 4 points higher than Bargs career best TRB.
Even if he plays poor D the rest of his career just being able to rebound the PF position adequately will make him a more useful player than Bargs.
Again, I think that Bargs career expectations as a #1 pick are what people compare him against. No one would bat an eye at his production if he was, say, taken at the 13th spot in a predicted-to-be-weak draft,.