I would think each kid would at least get a reasonable shot at QB. Just have to look at it where we are today. Here we are mid June and if Fergs had not left, we would still be in a 3 QB race for the job at UT with Worley likely leading. Then consider that the 2015 QBs are just about all off the board. Now say its June 12th 2015. Coaches have had a decent look at the 2 ATHs and maybe they stick, and maybe a move is considered. Your 2016 QB recruiting is screwed to say the least. IMO your not going to get 1. Then in 2017 your back trying to sign 2-3 more to make up for the 2 you moved and not getting one in 2016. 
Take 2 in 2015 and UT is set up well to get 1 in 2016. IF Jennings is moved to S after a shot at QB in spring camp, then getting a good 1 in 2016 should be VERY easy. Spread them out and you will have much less turnover.