The strength of talent on the D was already focused on the D-Line, with the addition of Sullivan - assuming he doesn't just go in the tank - only makes this more so. With McGinest gone and no clear starter next to Bruschi then LB core is really the weakest it has been in years if we're going to play four LB's. But, if we're playing three we look very good with Colvin, Vrabel outside and Bruschi in the middle. Vrabel seems to be a more natural 4-3 OLB since he doesn't have the top end speed you ideally look for in a 3-4 OLB and I believe Colvin played in a 4-3 to start his career. With Seymour (and Warren probably too) able to play DE or DT in a 4-3, we'd have a pretty fearsome rotation up front and get more PT for Green, who is getting pretty big bucks to be mostly a backup. Wilfork, Sullivan, Wright inside, with Green, Warren, Hill outside and Seymour playing both - whoa, that would be a tremendous strain on an O-Line to have all those guys rotating regularly. Wilfork is a solid penetrator when allowed to, which is just what you want from a DT ina 4-3, and Hill has been described as more of 4-3 end also but we haven't seen enough to be sure. Either way, our personnel appears to utilized more fully with 4 real (not a LB putting his hand down) D linemen on the field.