The hesitation I speak of is simple. You look at the three QB transfers we've had in recent years: Peterman, Ferguson and Jones.
Peterman was a product of the Dooley recruiting years and just never found a rhythm in the system CBJ put into place. Not to say he isn't a good QB, he just wasn't a good QB for us to say the least. However, he found a place where he is doing quite well and I wouldn't be surprised to see him get drafted this next year.
Ferguson was also recruited by Dooley and was an interesting prospect to say the least when he came to Rocky Top. But even he admits (now) to a lack of maturity on coming in to UT. And has expressed remorse on leaving while he was at Coffeyville. One could read between the lines and say he was making a veiled plea to return to UT after last season, but nobody reached out to him that we know of. I could think it would have been far easier for him to transition back into UT since he knew many of the players and still probably had a good idea of the playbook he left behind even with Debord coming in. But apparently no call was made even though he was being pursued by at least one P5 school and other G5 schools. Because I believe Ferguson would have jumped at the chance to return even given the starting spot was already locked up by Dobbs.
Then you have Jones, who left and was back two weeks later. You can say there was a limited window and no hesitation could be given, but you look at the difference in Jones and Ferguson. CBJ could have easily reached out to Ferguson and offered another shot this year with the caveat of "keep your nose clean and you get a chance at being the #2 in 2016 and potentially starting in 2017" and full out released Jones. But he welcomed back Jones without (what appears to be) any baggage and he's back where he wants to be. There was probably a good chance of starting at Colorado given the general dismal state of their program, but he has zero problems being the backup at UT.
I think you hit a good point that Jones could be a dang good recruiter for prospects coming in. But I'll also counter by saying Ferguson would be just as good or even better by saying "I've been on the other side of the fence and trust me, you want to come and stay here." Jones did the right thing by coming in with his hat in hand and admitting he made a mistake. But the same could be said in Ferguson admitting he was wrong in leaving as well.
This reply isn't intended to dredge up old memories of Ferguson and the controversy over his departure. But rather a comparison of two QBs that departed the program and one that was allowed to return without remorse.