It doesn'r really matter what you label him: FS or SS, because in Coyle's system, as previously mentioned in this post, and countless other threads, the safety's for the dolphins are now interchangeable. Both need to cover, both need to hit and stick the run.
The old SS for the fins was that extra linebacker who attempted to roam until he roamed into a play, now that SS and FS is labeled just S because both back end defender can actually cover, and be that last line of defense. We have been getting killed by TE's and explosive WR's because of our tackling safety that wont happen quite as often, now.