Remember, the Spurs already declined. Adding Jefferson to the deal sounds like it's been the deal breaker for the counter-offer from the Spurs. I've seen this offered to other teams as well.
Although, what if the Jazz do this deal AND they do the trade with Atlanta for Josh Smith (Kanter goes to Atlanta) since Minny, if they keep their pick are committed to Williams (refer to Williams trade thread) then our lineup would be this:
Parker, Watson, Price
Hayward, CJ
Jefferson, Millsap
J.Smith, Favors, Millsap, Evans
A.Jefferson, Fes, Evans
Is that a winning combo or just way too much salary committed to a playoff team?