They're now saying Hayward didn't play because his hamstring tightened up.
http://www.jsonline.com/blogs/sports/275199021.html
While the Packers planned on using House regardless, defensive coordinator Dom Capers indicated that Hayward's hamstring -- the one that gave him so much trouble last year -- tightened up.
"I don’t know what the medical status of Casey was at that point in time," Capers said. "We’ll have to find out there. Really, Bush was healthy and ready to go, and I don’t know that Casey might have tightened up just a little bit. With his hamstring issues in the past, you’re always cautious of that."