By Alek Arend If Tom Brady retires this offseason, will Rob Gronkowski join him? There’s a growing belief around the NFL Brady has played his last down in the NFL. His 2021-22 season ended on a sour note and he started to take some big hits towards the end of the season. Oh, and don’t forget he turns 45 in August. It’s worth a reminder Gronk came out of retirement because of Brady. The all-time great tight end wanted to reunite with his former quarterback and play for the Buccaneers. So, in the event Brady retires, will Gronkowski do the same? NFL insider Ian Rapoport thinks so. “I’ve always b…