Rosenhaus says Gronkowski back surgery not serious, doesn’t change timetable for return

It’s alarming, to say the least, to know that Patriots tight end Rob Gronkowski needs back surgery after a quartet of arm procedures. His agent, Drew Rosenhaus, downplayed the gravity of the situation on WQAM radio in Miami earlier today. “This is a lingering problem that Rob’s had for a while that’s he’s been playing…