First, the Red Sox have had susperstar FA pitchin leave - his name was Pedro Martinez and he was the Yamil Pulido of actual MLB. He also wanted as much money as he could get, with as many years as he could get.
Since erff is on record, multiple times, as being unwilling to offer a max deal, I think Yamil is totally justified in going FA; he's seeking max value. He'd resign after rollover if erff offered the max. Based on the tiebreakers, erff could not lose, if he were to offer the max deal.