Since when do pitchers revive their careers in Colorado?

After his win today against the Padres, Jason Marquis is 3-1 with a 1.56 ERA over his last 4 starts. He is leading the Major Leagues in wins with 12.

He's got a good chance at 20 wins, which would be an amazing accomplishment for a pitcher on the Colorado Rockies. He's had a decent career, but he was only 37-34 with a 5.08 ERA in 2006-2008 with the Cardinals and Cubs.

His other stats aren't overwhelming (61 Strikeouts in 131 innings) and he's not winning the Cy Young Award, but he is having a really good year, and has a decent shot at being the ace on a postseason team.