On a semi-related note..I think I read that the biggest rushing games the Pats have allowed have been against zone blocking schemes...Mighta been in a Barnwell piece on Grantland.
And personally, Im not underestimating their defense..Wilfork can be a problem in the middle..Ive been a fan of Jamie Collins since I watched him a bit last season and Revis/Browner/McCourty are legit. Ninkovich is a hustler too.
I think even in my pre-season bold prediction post I said that the Pats D would end up top 3 in certain metrics.