Ok, let's be reasonable about this; is Jimmer better than both Watson and Tinsley? I think he might be but perhaps only just. As we have seen a LOT recently, the Jazz are good at finding players that are being misused on their current teams, and Jimmer definitely falls into this category. Jimmer is earning about 2.4 mil per for the next three years assuming his team picks up the option. The combination of Earl and Tinsley is roughly three million. If Jimmer preforms say 33% better in a system instead of one on one basketball, then I think he's better than any backup point guard we have.
There is one problem, and it's the hype that follows him. I don't think the Kings can give him away for nothing (aka Raja) and I don't think they would feel they got value with Earl and/or Tinsley, and there isn't anyone else on the Jazz that we would feel comfortable letting go of, so unless the Kings want to get rid of him just to get his salary off the books, I doubt anything happens, but I wouldn't mind it if it did...