I think it's pretty clear who the best tight end we've seen in the NFL since we began grading in 2006 is. : r/Patriots
Rob Gronkowski retires: Patriots tight end is best in NFL history
Rob Gronkowski is already among the best tight ends in NFL history
NFL draft: 7 Rob Gronkowski replacement TEs for New England Patriots
Rob Gronkowski Hints at Retirement in Response to Birthday Post
Gronk's legacy: How does he stack up among the best to ever play tight end? - The Boston Globe
Rob Gronkowski retires: Patriots tight end is best in NFL history
Eagles' Zach Ertz, Patriots' Rob Gronkowski headline premier tight-end duel in Super Bowl
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Former Tampa Bay Bucs Tight End Rob Gronkowski Announces his Retirement from Football - Bucs Nation
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Rob Gronkowski played the goofball but few can doubt his greatness, New England Patriots
Patriots: Tight end Rob Gronkowski has carried tight end position to new heights