You are looking way too far into this. You can see it on all-22.
The Bengals were throwing everything underneath in the middle. Ramsey got lazy and uninterested, and was just standing there. Erickson decided to run right by him, and Ramsey was still standing there until Dalton threw the ball. After the play was over, you could see Ramsey in distress, a reaction of somebody that gotten taken advantage of because his head wasn't in the game. He clearly didn't think the Bengals were going to try to score, and I'm sorry, you have to be prepared for ANYTHING in sports, at ANYTIME. This defense, even when they got torched against Tampa, plays hard to the whistle, every single down. That is the CULTURE here.
I played organized sports for many, many years. Team culture was always a top priority, because it sets the pace and expectations for everything.