Give Tannehill the weapons. Let the boy rock and roll. The Falcons didn't hesitate giving Matt Ryan the best TE of all-time in a trade soon after they knew Ryan wasn't going to be a complete bust.
Sanchez is garbage but when he's without Keller he's a bigger pile of extra hot garbage. The Colts were smart enough to not only draft one tight end, but drafted TWO TE's with Allen and Fleener, to go along with Luck, and bringing Wayne back (even he was surprised), etc. Allen has been very good for them, and Fleener has helped too. And they brought in some reinforcements up front.
You finally get that young QB, don't hesitate in getting him the weapons to develop.. and so he can develop together with some other young talent.
The defense is already good enough to compliment a high powered offense on the other side for the Dolphins. If the Dolphins were to let's say take Keenan Allen and a Tyler Eifert early in the draft, along with the players they already have on offense, the running game, and with Philbin's offensive philosophy and mindset, the Dolphins will be grabbing good leads early in games which will make opposing offenses one-dimensional really helping out our defense. I would go hard and early for a WR and TE, then spend all the following picks on the defense (maybe double up on a WR if a good one falls in the mid rounds) .. Sprinkle in some cheaper free agents for defensive depth but make better decisions there.
Unless there's a generational talent on defense that is a can't miss all-pro and has high potential to see the hall-of-fame, I support Tannehill all the way as my 1a and 1b and 2a motives heading into the draft.