a little tangent here.
nmamdi is the only shut down corner so far. very close behind him are bailey and revis.
bailey is on a defense with a better pass rush this year. this definitely helps him. can we say the same about nmamdi? oak last few years pass rush has not been feared. yet he still has.
revis is on a D with INSANE pass rush. stick him in oakland and can he do the same? my guess is not, but i won't take anything away from him--he's still very good.
another point to look at is how often they roll over the safety over the top. i recall moss saying they rolled one over on him a lot. in the revis int play, yes the safety was rolled over, but i don't think it mattered on that play. a combination of rush, 1.84 second release and moss poorly running it gave revis goods.
as for cincy, leon hall is a pretty good corner. i also recall someone saying he noticed safety help over greg jennings. the fact that the RT on GB got humiliated did not help rodgers find him.
so it's an entire team effor that shuts down a wr1, not just the corner, unless your name is nmamdi.