If Arrington signed/Trade Pick!!
I believe that with the signing of Lavar Arrington, the Dolphins would fill every must need. We already added three to our secondary, upgraded OT, and obviously got our Franchise QB. If we add a Pro Bowl Linebacker also, then I think it would be smart to trade down in the 1st round. The next three needs in my opinion are S, DT, and then WR. We could trade down, add a second round pick, and then get possibly two big time contributors for next season.
I like the idea that other thread had where we trade with the Jets. That not only gets us a 2nd round pick, but an early one at that. So, we make the trade, then we have two rookies that can contribute right away, and we can also go in with the "Best player available" mentality. Because other than maybe RB, TE, and QB, you could make a case for drafting at any other position.
Now, I think we wait until during the draft so we see how things shake out. There are players that could fall that are worth taking at 16, but it is probably unlikely.