For starters, they won’t have any of the three guys you mentioned. They couldn’t win with Brady last year, but a part of that is due to the ton of injuries they had. A BB team is not going to tank.
Brady last year was not the guy that lit up the league in 2007. Yes, his receivers weren’t great, but it’s not like they were the worst unit in the history of the league.
If BB were so concerned about the QB position, he would have brought in other guys last year or would have positioned the team to sign one this year. I am pretty sure he knows what he is doing and knows where things stand with Stidham.