To summarize the article, our defense only does well with superior pass protection. There is some credence to the theory, like the near all coverage schemes in the '01 superbowl and the chart the guy uses. We also play a passive bend-but-dont-break defense a lot.
But truth is, we don't put a lot of emphasis on cornerbacks. Short, good coverage guys with a quick twitch that we pick up late/after the draft and other team's leftovers. Randall Gay, Leigh Bodden, Ellis Hobbs...
And say what you want about Hobbs, but he was excellent at covering without getting a PI. Those are the guys Belichick looks for. The last couple years he's picked them out of the first two rounds, probably indicative of how much more difficult it is for DB's in today's league.