The Browns quarterback situation was horrific last season, with so many going down with injuries, including Deshaun Watson. Overall, Cleveland used five QBs. Yet the Browns still made the playoffs, thanks, in part to the ageless Joe Flacco. The 38-year-old was home in New Jersey, out of football, when Cleveland called after Watson suffered a season-ending shoulder injury. Flacco went 4-1 down the stretch and earned NFL Comeback Player of the Year. But the Browns’ fortunes rest on Watson’s surgically-repaired throwing shoulder. Watson is healthy now, but at least one NFL expert isn’t expecting …