Very observant; Clark does have a low release point, but it didn't seem to affect him in Orlando against quasi-NBA defenders. He moves extremely well without the ball and finds open looks. He also has a very-quick release, making it more difficult for the defender to close out on him. Still, your comment started me thinking about other players who have what you describe as a "funky release point." The first name that comes to mind is Kevin Martin, now of the Timberwolves. He almost shoots a set shot, the release point just above his right ear. I don't think his release is lightning-quick either; he just has a knack for finding seams in the defense. Clark seems to go to the hoop better than Martin as well. Who else? Oh, yeah, Mike Conley of the Grizzlies. His release point is even lower than Martin's, and he can't jump at all. But he's a clever dribbler and achieves separation with an unguardable pull-back. Grevis Vasquez somehow gets his shot off with no leaping ability, as does Ridnour. Again, you may have identified a major flaw in Clark's game, but I think he'll overcome it.
Obviously, I'm very high on Ian, especially after enduring years of poor shooting from the 2 (except for Hornacek). I've come to dread any player analysis that suggests that "his outshot shot needs work." That was the knock on Burks, and I'm still not confident in his ability to hit a clutch jumper. Here's my prediction: Clark will do so well in fall camp that the Jazz will trade Burks to Phoenix or Boston.