I had more or less forgotten about Jarrett Jack, but remember liking him when he came out of college.
He has played well and is on a nice reasonable contract.
If the Cs were in the market for a Guard, I'd be all over this. But the Cs biggest need is big man. Other than providing a potential "asset" that will be useful to the Cs in trades next year, I don't really see how Jack helps the Cs that much right now.
And I see no reason to trade for Ariza.