We all know the Red Sox rotation looks incredibly bad on paper, and there are a lot of ways to contextualize that. Nathan Eovaldi, who switched to the bullpen last year after injury and underperformance, is the staff ace. Ryan Weber, who has been a Quad-A journeyman for his career, is the number three. Zack Godley, who fell out of Arizona’s rotation and ended up in Toronto’s bullpen last season, is the number four. They literally don’t have a number five right now. It’s all looking bad. My go-to explanation for what this rotation looks like, though, is that Martín Pérez is the number two.