If Rob Gronkowski is not on the field, the tight end will most often be an extra blocker, whether it’s James Develin, Michael Hoomanawanui, Steve Maneri, or someone else filling the role. The phrase “[insert offensive lineman] has reported as an eligible receiver” — signifying that the Patriots had put an offensive tackle at tight end in a jumbo package — echoed through Gillette Stadium time after time on Friday night.