Bill Belichick, Robert Kraft and others react to Gronk's retirement

Rob Gronkowski turned the NFL world upside down last night when he announced his retirement via Instagram. Since his announcement, he's received an unheralded amount of support and congratulatory messages from teammates current and past, Bill Belichick, Robert Kraft and others.

Both Belichick and Kraft released official statements through the team. 

Tom Brady was one of a ton of players to honor Gronkowski via social media.

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