Munneryln is not without flaws defensively, but he's becoming a very good punt returner. Of all PR's with at least 20 return attempts, Captain ranks 5th in the NFL at just a shade over 11 ypr.
That's very good production, and it seems to me that he's cured the fumbling issue. Parcells used to talk constantly to his PR's about the proper technique in fielding a kick (athletic stance, forward lean, ready to sprint). I'm seeing, from the past few games, a much more fundamentally sound effort from 41's end.
If you can pick up 11 yards every time you touch the ball, that's huge, and well above the league average for those who do it regularly. Mark Jones was a prime example of this in 2008. He was extremely consistent at KR and PR, and it proved to be a big lift for the offense. When this team gets the offense going again, Munnerlyn's continued production in that area will become more of a recognizable gift.
Defensively, I think he and Marshall are still working through inconsistencies, but corners always have shitty games, occasionally. Marshall seems to struggle in both man and zone down in the red zone, but that's probably (in part) a bi-product of having a Nic Harris at LB.
Gamble's a bit more of a disappointment because of the amount of money he was paid. Again, I'm not a cap wizard, but I'm guessing his 50+ million deal doesn't help matters.
That's Revis-Island money, and quite frankly, we incorporate a style of defense where paying a corner that kind of money is counterproductive. You can run an effective C2 scheme (or pure Tampa2) with several things in mind:
1. An understanding that you will not be a very good run defense, by default, against teams that run in a style that Cleveland and others do.
2. A need for 2-3 quick, small, strong ends that have a fast jump.
3. Having a pure 3-technique DT, which I don't feel we have--or at least, one that is worth a shit.
4. Corners that are physical on the jam, and wise on the reads in their zone.
5. Safeties with range.
6. A stable of quick LB's who can also take on FB's and G's without the presence of a dominant NT or DT. They also must be able to adequately cover backs and TE's, and unfortunately, we've had issues in that department of late, particularly Beason taking some shitty angles on backs on simple checkdowns.
We have the ends with CJ, EB, and Hardy. Ed Johnson is pure shit, and just needs to leave the city. Neblett is what he is, so whatever. Landri, I would keep, as he's a veteran with some big game experience with Jacksonville, and has not been terrible. Hayden, eh. DT is a vital need, for sure.
Sorry for the rant. But, yes, I see much more upside to Munnerlyn as an overall contributor to the operation (DB/ST) than I do Gamble, at this point.