By Andrew Holleran While Tom Brady has announced his decision to play another season, his longtime running mate remains undecided. According to a report this weekend, Rob Gronkowski is 50/50 on whether or not he will be returning for another season. Gronkowski has reportedly made it clear that if he does come back for another season, it will be with Tom Brady and the Tampa Bay Buccaneers. NFL fans believe Gronkowski will probably be back. “He’s still playing at a high level,” one fan tweeted. “Well of course why would he wanna play with any other QB?” another fan tweeted. Gronkowski sent a mes…