There is no doubt in my mind that Moore will not be a Dolphin next year (unless Tannehill is out a while and he steals the starting spot with elite play - doubtful). There is no way we tag him, and no way he stays knowing he has no shot at starting. Some other team will offer him a legitimate chance to win the starting job, and will be willing to pay him more.
So the only question for me is, is there any way we trade him? To me that depends on 2 things: 1. their confidence in Devlin, and 2. their true realistic feelings on what we can really accomplish this season.
If they feel that at best we are not quite there yet and need one more draft to really turn the corner, it might be smart to see if we can get another high pick heading into the draft. We'd be taking a very big chance of folding this year if Tannehill truly goes down, but if they don't see us really able to compete for it all, the reward could be worth it. We already have extra 2nd and 3rd round picks - could we add another? What an incredible advantage that would be to add to an already surprising, young, up and coming team...
Bottom line is if we don't, he walks next year anyway and we get nothing but one more hole to fill.