How big was Barwis' role? I don't know, but quotes from Lewan:
"We just kept playing," Lewan said. "All that hard work with Mike Barwis definitely helps in the end. These are the kind of games where you know things Mike Barwis is doing are helping. When you see guys running around like it was the first play and there's no problem … Mike is a phenomenal coach."
From The Detroit News: http://detnews.com/article/20101107/SPORTS0201/11070337/1478/rss#ixzz14eE6oWkg