I liked Biggers on film in 2012. He was solid. Disciplined, used his hands well, definitely can run and very agile. Not aggressive enough at times. Still an improving player. He has a history of playing poorly. But in 2012 especially with some scheme adjustments as Schiano came in, I thought he was better, more at home. I can't comment on Munnerlyn except to say his metrics are kind of average. I just haven't watched him on film.
If you're going by metrics instead of film then there are some bargains out there. Chris Owens has good perimeter metrics and I was a BIG fan of his coming out of San Jose State. He was a ball hawk there. But he's a little like Sean Smith in that he was a ball hawk in college and it hasn't translated to the pros. Good against the run though. Always positive marks there. Was a big time tackle accumulator in college. He's shown a tendency toward that in the pros as he's only had 1175 snaps in the pros but PFF has him down for 102 tackles. That makes him a lot like Antoine Winfield and Cortland Finnegan as far as his having a tendency to find the ball and make the tackle. Chris Owens is the kind of low price, high value acquisition that makes sense REGARDLESS of your plans at the position. Right there along side Bradley Fletcher, Antwan Barnes and Mike Goodson.
The cream of the crop would be Antoine Winfield despite his age, Brent Grimes if you're going to pretend his Achilles doesn't matter, and Pacman Jones if you can be relatively assured he's a good citizen nowadays. Whether you're looking on film or you're looking at the metrics, these guys are great on the perimeter and Winfield is also great from the slot. But the fact of the matter is...all of those cream of the crop guys have big time warts. Winfield is 36. Grimes is coming off the Achilles and he's always been a small guy that makes his living off explosiveness, so you really worry there. Pacman has a big time history of trouble and will find himself suspended if Goodell even catches a whiff of problems.
It makes me think the Dolphins should look for someone that doesn't have warts and if that means they've got to pay up a little bit for that, so be it. Sam Shields would be that guy. He's 25 years old and one of the fastest, most agile and explosive men in football. I always liked him at UM, he always flashed even though he was extremely new to the position. He came in and what he did as a rookie with the Packers was impressive. He followed up with a less impressive second year (where've you heard that before?) but a MUCH better third year. Legitimately good in 2012, both on film and on paper. Had 5 interceptions in only 12 games.
If the Dolphins were to sign him to an offer sheet and the Packers didn't match, they'd have to send their #42 pick to Green Bay. Could be worth it. Not sure you're getting better than Sam Shields at the #42 overall pick and anyone you sign in free agency at this point has some serious warts.