He's having a really good spell, really dominating strikers, but I have a concern that if Agger is injured Carra will come in and the team will start defending that 5-10 yds deeper again and all the good form will go out the window.
I agree, and I think the problem with that is when Carragher gets back, Skrtel has to shift to the left where Agger normally is and he does not like defending from there and gets into all sort of trouble. He is much more comfortable defending from the right.