Yeah, the dude can fling a 9 route as good as anybody, and if you cover Ruxer to close early in the route you are getting burnt. That only works once against a good team if at all, so not terribly useful.
I'm not sure that what you are saying will be "developed" this fall or the next. I'd be surprised due to his ability on his legs, the answer will be "why throw when he can run". He isn't what Jay was on his legs (I've never seen anything like Jay in high school in person), but Jett has a couple years yet--obviously we are all hoping he will surpass Jay. It appears that he may lack some size--he is only 16 though.