The cover-2 vs. the 2009 Bengals...
DL predominantly rushes around the edges, and the DTs get no push.
OL gets huge push, run-blocks well, and the RB is a sledgehammer.
DBs play off the ball, never bump-and-run, and cover "areas"
A talented group of WRs run free through what is essentially a timid zone, while a QB with pin-point precision continually finds the holes built into the cover-2.
The 2009 Bengals are perfectly built to destroy the cover-2. Perfect Storm, indeed.