Ken Hamlin is a Dynamic player for Dallas and the key to the whole defense because his play has a huge impact on how the team performs overall. Hamlin played poorly against the Giants and the Pats with the result that Dallas beat one opponent but not the other. When Hamlin has played above-par Dallas is undefeated. So in essence, Dallas is a 500 team when Hamlin has a bad day and a 1000 team when he has a good day. If he plays bad, Dallas chances of losing greatly increase. In correlation with that, Dallas has not had both of its starting CBs healthy when it has faced NY and NE. Combine that with Hamlin's poor play and you see why the defense has struggled against these teams.
Everyone has noted how the whole Dallas Defense has played poorly against the two best QBs it has faced (Maning of NY, and Brady of NE). I think this viewpoint is too simplistic and lacks real analysis. That’s because it concludes that Dallas' defense is not good enough as a whole when facing good QBs, but it ignores the fact that the defense has been likewise undermanned in these situations at CB. What I see is that Dallas' defense has struggled against two teams that have above-par WRs. Yes, their QBs are better, but also are their WRs. And these teams gave Dallas' defense fits without both of Dallas' starting CBs on the filed.
So Hamlin is catching pressure on both sides in these types of ganmes. When Dallas' secondary is undermanned and the opposing passing-offense is above-par this puts too much stress on Hamlin to man the whole secondary (because Roy Williams sure won’t do it), and Hamlin breaks in these situations. But that doesn’t make him a bad FS. In fact he is above-average, just not a pro-bowler (but still much better than anything we’ve had).
In the end, I can't fault Hamlin for his struggles against above-par passing offenses because the defense has been undermanned against other not-so-good passing offenses, and in those cases Hamlin seems to be able to make up for Dallas' deficiency in the secondary. So in the end, while he is not playing at a pro-bowl level, he does give the defense the best option at FS, and I truly believe, based on what he has shown on the filed, that if he ever has a chance to face above-par passing offenses with a healthy Dallas secondary by his side, he will not have the breakdowns he has had, he will instead play up to his par, and the Dallas defense will start shutting down these so called above-par passing offenses and their “great” QBs.
**