Why this NFL historian thinks Gronk is the greatest NFL tight end of all time

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League historian John Turney thinks New England's Rob Gronkowski is the best tight end ever. Why? Keep reading.

The minute Rob Gronkowski announced his retirement, supporters were calling him the greatest tight end ever.

Of course, that's debatable, and NFL historian John Turney of Pro Football Journal wades knee deep into the conversation. In a comprehensive look at the greatest tight ends of all time, In the end, Turney takes the plunge and moves Gronkowski to the top of his board -- ahead of the Colts’ John Mackey and the newest member of the Pro Football Hall of Fame, 2019 inductee Tony Gonzalez.

The reason? It’s all right here …