I don't really ever compare Parker to Kidd because they are completely different. Parker is a scoring point; Kidd is a distributing point -- he flourishes in the transition game and all the offense flows through him.
My main hesitation in the acquisition of Jason Kidd is simple.
With Kidd as a Spur, the offense would run through Kidd and the Spurs would be more of a running team than a half-court team.
We all *know* that Tim Duncan has won two MVP's and two les with the ball going through HIM.
Do we know that Duncan's game will improve if the offense is run through a distributing point guard like Kidd instead? Has Duncan ever played with that kind of point guard? Ever??
Can you guarantee me bringing in Kidd is going to improve Duncan's game? It might make sense that it would because the floor would open up, he wouldn't have to handle the ball as much, etc. But do we know for sure that Duncan can still be Duncan if things change?