Vacarro is probably gone after this year. Even if they re-sign Kenny, they have no FS on the roster. With the NFC South turning into the WAC circa 1990's, a true centerfield safety is a must. Never turn down a DB with a nose for the football. Plus, his combine performance was just just behind Melafonwu in terms of freakish ability.
This was arguably a bigger need than pass rusher.