How so? Lance can defend the 3 better than Gordo. If the Jazz can sign Lance outright, and use Gordo+ in a S&T to upgrade elsewhere, it's a no-brainer IMO.
Also, I think the Lance=headcase stuff is a bit overblown. First, when the Pacers went into a tailspin, winning only 10 of their final 23 games, Roy Hibbert and Paul George, the team's two max all-stars, played like absolute ****. Lance may not have directed his frustration appropriately, but he continued to compete and play fairly well. Second, the Jazz need talent. Good players and coaches figure out how to use good talent. The 3 primary needs of basketball teams are scoring/creating, shooting/floor spacing, and defending. I'm not sure Gordo does any of those things better than Lance.