I don't believe Wilfork has any incentive clauses in his contract with the exception of his weight and workout bonus clauses. His deal was pretty straight forward for 5/$40 with $25M guaranteed (basically his bonus and salaries through 2012). Last two years are remainder of the money with no guarantees although if he shows up in shape and plays he should see it all given what the $$$ for the position will be rising to by then.