The Jazz would be insane if they wouldn't trade anyone but Deron for Marc Gasol. I'm not even sure I'd keep Jefferson if it meant getting Gasol.
Legit 7-foot, true centers with a complete game and no injury problems are almost IMPOSSIBLE to find.
AJ is a star. Gasol is a role player. Yes, he is big, but he is a role player, no more and no less. You don't trade a star for a role player, even if the role player is 2 inches taller.