First off, their record wont have anything to do with Favre missing time. They dropped a couple early games last year (one to Arizona even), and rebounded.
Also, Brett Favre, if you can count on anyone to show up for all 16 games, he's the guy. His streak in football is infathomable; its that impossible for someone to come close to repeating. The only way he's missing a game is if his arm gets ripped off.