Live Arne Christensen chat Saturday, May 30th at 1 PM PST

There was some talk after the Arizona Cardinals pulled off the upset victory over the defending NFC champions at Levi's Stadium that the San Francisco 49ers may have been rusty. There's no doubt that the team was banged up entering the contest. It entered the game without two receivers who figure to be key contributors this season and its starting and backup centers out of the lineup. Then the 49ers' All-Pro tight end, George Kittle, suffered an injury midway through the contest. Although, he kept playing because ... well, he's George Kittle. But did the lack of a preseason impact the 49ers' performance during Week 1? Maybe. But it's probably not the only thing that affected the team on Sunday. It is worth noting that every NFL team was on equal footing when it