This is how I see our QB situation and its effect on the cap.
First consideration is who will we have in the QB positions:
1) We have Tannehill as QB. There is no scenario I see with him leaving.
2) I remember Cutler as being on a one year contract. There is no reason to believe we will bring him back.
3) Moore is a serviceable backup QB and will probably be back, but I suspect we will look for a replacement backup QB over the next two years.
4) Fales is here as a stop gap measure at QB. Unless he shows himself to be much better than Doughty, he will probably be released.
5) With either Fales or Doughty as our 3rd string QB, I believe we will try to bring in QB competition thru the draft every 2 or 3 years, determined by the quality of QB's available vs. other positional demands of this team. Hopefully one of these men will rise to the position of backup QB, allowing us to develop a new 3rd string QB. I look forward to eventually seeing the Dolphins draft and grow our own 1st string QB.
This should leave us at the same level of QB expense as last year plus any increase in those salaries, unless Tannehill restructures his contract with us, which I hope would actually reduce our QB cost vs. the cap. Because of all this, I feel our expenses at this position are under pretty good control.