For this one Sunday, for this one must-win game, for this performance that combined guts and efficiency, all doubt is suspended on the topic of Brett Favre. If he had been playing on two sound ankles, you would have said he was great. The way it was, with his left ankle badly sprained, with his mobility limited, with the Chicago Bears sending everybody but the ghost of George Halas at him, you would have to say he was somewhere between great and perfect. The Green Bay Packers quarterback tied a franchise record with five touchdown passes Sunday. On one good wheel, he led the Packers to a 35-28 victory over the Bears.