If Lamar got hurt, I highly doubt the Ravens would stick it out with Josh Johnson, I'd bet money they'd go get a better QB. They have incredible talent on both sides of the ball, hard for me to believe they only win 6 games without Lamar.
But yes, the original point I was trying to make was that the Bills would struggle the most without their QB. I know it's last year so it doesn't count (according to Bengals fans), but the Bengals played 7 games without Burrow and went 4-3, they were 5-5 with him.