If Gronks cool with Belichick, why is he a Buccaneer?

When Rob Gronkowski was traded to the Buccaneers so that he could come out of retirement, everyone assumed it had something to do with Bill Belichick. Rob Gronkowski went onto ESPN and settled that part of why he left.

Here's what Gronk told Greenberg, “It’s always been a great relationship actually and I’m super blessed just to have the nine years that I had there, big time. I’ve learned so much throughout my time there. But I would say the relationship is fine. I mean, I really haven’t talked to (Belichick) at all since I’ve been traded to the Tampa Bay Bucs, but if I see him in the streets, if I see him out at an event, a football event, wherever it is, a charity event, I have absolutely no problem with him.

I feel like we would just kick it off like we normally would, any event. Talk some football real quick, because you know he’s got to always talk football, and just catch up quick. But I feel like there’ll be no problems at all and we’ll just kick it off like how we normally do.”

Gronk was obviously hurt when he retired from football in 2019. However, the Patriots could've used him in 2020 and could've found a way to extend and adjust his contract for him to play in 2020. So the question is this, if Gronk had no beef with Belichick, what was his beef with the organization? 

Now one could say that he only wanted to play with Brady, that's possible. However, it's also possible that he didnt want to play for the Patriots any longer. It's possible he didn't want to play with Stidham or Newton. Or it could be that they just didn't want him back. 

I mean after all, Gronkowski missed 29 regular season games during his time with the Patriots and lord knows how many playoff games. That's almost two full regular seasons out of his nine with the Patriots. The real issue between Gronkowski and the Patriots; And why he's a Buccaneer, we may never know the whole truth.