would most likely have to give more than just the third pick. Lets say the trade is #3, Jordan Mickey, 31st for Favors.
Utah is said to be very high on Trey Lyles at PF. Gobert already provides them with stellar interior defense, which i wouldn't go as far as to say makes Derrick Favors expendable, but at least provides them more flexibility if the right deal comes along.
Favors is young, productive, and on a reasonable contract so i could see why the Jazz would have reservations about moving him. But what a fit he would be in Boston!