If he misses any time this year, or regresses any, he won't get a big offer from anyone. If he plays well but misses 3-4 games, the Packers can probably get him for a year on a make-good contract a la Raji, or sign him to a 2-3 year deal at a reasonable rate with most of the bonuses doled out on a per game basis.

It's possible that he gets injured early an Sherrod steps up making signing Bulaga irrelevant, but that isn't hugely likely and doesn't change the scenario for the Packers, only the name.