Pittsburgh’s Unique Four Quarterback Roster Faces Major Challenges Ahead

The belief that the Pittsburgh Steelers would keep four quarterbacks on the 53-man roster went from fringe to mainstream by summer’s end. When the team rolled out its initial roster Sunday evening, that thought became reality. Aaron Rodgers, Mason Rudolph, Will Howard, and Drew Allar entered the spring as the team’s four quarterbacks. They exit as a group kept whole. That’s the easy part. Rare as it is, it wasn’t particularly difficult for Pittsburgh to make the roster math work. But now it’s time for the hard part: keeping all four on the roster for the next 18 weeks. “Those…