In my opinion, the back seven is where the emphasis needs to be in the upcoming draft. Does Miami have anyone opposite Howard? Is Tankersley the long-term answer or more of a third corner like Lippett? Those are big questions moving forward for the secondary.
The need at linebacker is obvious. Timmons, regardless of his current situation, is a short-term answer. Miami needs to find a linebacker who can play the pass and the run. Above average please.
You are spot on about the other positions as well, but I'd add pass rusher even if Harris emerges. The offensive line is constantly an area of need despite some nice talent there. I don't know why the front office, powers that be, can't put the finishing touches on this unit.
I hope the team can find a tight end in the middle of the draft. I don't think the Dolphins will have a lot to spend in free agency with contracts like Pouncey, Landry and James needing to be resolved one way or another.