Lito's injury history hasn't been bad at all, quite frankly-aside from being IR'd around midseason in '05(pretty much 1/2 of the Birds' roster was on IR as well that year), he would only miss the first 2-3 weeks or so at the start of each season, then get stronger as the seasons would progress, only to play gangbusters at the end.
BTW-Reid reportedly wants that Vandy OT(Chris Williams). If I were Pioli/Belichick, I would ask much, much more than Lito and their 19th. Reid salivates over lineman, so it wouldn't be surprising if he sells the kitchen sink on this one.