As for the safety group, it is somewhat of an enigma at the moment. NE's depth is the best in the league, having NFL quality players down to the 5th guy (6th, if you count McGowen). Consider how much NYG's defense shat the bed in 2009 when they lost a single guy as well as Pitt's serious falloff from Troy and you realize how different NE's roster is than most.
That said, only Chung and and Sergio Brown are signed beyond this year (a couple are FAs already), so NE is going to have some decisions to make. On top of that, NE's best defenses consistently had two upper tier starting safeties. Even if you count Chung as someone who will emerge, that still means one more elite guy is needed to bring the defense into prominance. I'm not sure that guy is on the roster at the moment, though Page looked like he was earning some trust before getting hurt. Ras-I is another option, though BB seemed to indicate CB is where he will start.
I personally think NE is going to address the safety position with one of their 1st or 2nd round picks next year.