It doesn't matter what you feel or I feel about Sergio. The end result is that making a deal for a rental reserve made ZERO difference. Your feeling doesn't change that fact.
This has nothing to do with hindsight and everything to do with foresight. Before the draft, this move wasn't going to make a difference.
Again, let's remove Blair from this. The team knew these things before this deal went down:
-Beno was inconsistent, but still had a significant contract. The Kings were coming off a 17 win season, so with the #4 pick, they were going to be giving their lottery star plenty of playing time in the backcourt. They also knew that with Beno's deal, it would be hard to move him if he wasn't going to improve. Thus, they knew they had a starting and reserve PG ALREADY LOCKED UP before this trade went down.
-They were going to use a #4 pick on a guard. A pick of Curry, or Jenngings, or Evans was still going to mean a guy was going to either start over, or back up Beno.
-Sergio could opt out and be a free agent after the season.
Those three things are enough to tell you and anybody else that trading FOR serg was going to make ZERO difference for this team. But that attitude (that is a consistent approach with GP, and not an isolated thing) actually matters with it costing the kings something in the long run.