Jay Gruden’s dance card keeps filling up while Jon Gruden sits and waits

Not that long ago, Jon Gruden widely was believed to be a perennial A-list coaching candidate.  His brother, Jay, was a career Arena League coach who spent some time with Jon’s Buccaneers thanks to a football tradition that dates back even farther than playing on Thanksgiving:  nepotism. Now, Jay has become a star.  And Jon…