I think that biggest problems is that all the injuries are on the defensive side, like Joy said.
We lost playmakers at all positions, Barnett, who wasn't playing amazing, but still is one of the leaders and quite a stopper in the middle.
Jenkins is a strong run stopper that can also make quite a push towards the QB, while our DTs are pretty much innerchangable, we don't have any RE like Jenkins.
That pretty much killed the defense, and we're not even talking about the DBs. We could take on injury, but when Rouse had to play SS, his lack of experience shined (At least, I hope it is his lack of experience) when trying to make tackles and sometimes ballhawking to much.