The Bills have fired offensive line coach Juan Castillo. It was the first personnel change of the offseason. Castillo was blamed for the lackluster performance of the line that struggled following the retirements of Eric Wood and Richie Incognito. He spent several years with Sean McDermott in Philadelphia and later worked for the Ravens. MORE STAFF MOVES ARE LIKELY IN STORE. THE BILLS HAVE SIGNED BACKUP QUARTERBACK DEREK ANDERSON TO A ONE YEAR DEAL. EXPECTING ADDITIONAL ANNOUNCEMENTS AS THE ROSTER IS TWEAKED, WE AWAIT WORD AS 1BUFFALO.