I see no hurt in letting the kid have a shot at QB. For comparison purposes, I went back and watched Jennings highlights and Gibsons.
Obviously I'm not professional talent evaluator but Jennings looks extremely raw as a QB, but there seems to be potential there. He threw several dimes that his teammates dropped that would have been TDs. His arm strength looks average maybe better.
Gibson, at least to me, looks like the better runner of the two. He looks faster and he rarely gets caught in the open field. Jennings didn't break off as many long runs in his film. But the knock on Gibson seems to be his accuracy as a passer. Gibson sorta just lobs it up high and let's his guy run under it, that doesn't cut it at the next level. Jennings passes looked to have more zip, even on deeper routes.
Assuming he commits, even if Jennings never takes a snap at QB at UT the bottom line is UT is getting a great athlete and if the kid wants a shot at QB he should get it. The potential seems to be there the only question is if he can translate it to the next level and develop his skills and progress. Jmo