Actually, it was Bossard that rebuild the field at Wrigley some years back. They dug it out and he re-built it from the bottom up for drainage and the like.
http://prev.dailyherald.com/story/?id=65153
Just because Dallas had one bad start, doesn't mean he isn't reliable. Watching him leave everything up and struggle with control, and then exit early, I am going to guess we find out after the playoffs that his back is still bothering him.