What an absolutely insane first few weeks it’s been in the NFL. Seventeen teams, 17!!!, are still over .500. And it’s just crazy how one week a team (let’s say, the Giants) can look like total crap and then the following week come out and smoke a top-five team like the Falcons. Powerhouses like the Bengals losing to junk teams like the Buccaneers and surprises like the Saints are making this season something to watch. It’s almost impossible to tell who’s going to be left standing at the end of the year.Especially after Monday night’s Bears-Cardinals game. Chicago has looked like far and away the best team in the NFL. The offense was rollin’ up the points, the defense was shuttin’ teams down and appeared to be playing with such consistency. Then, Arizona, a dreg of a team, gets them at home and blows their doors off. But, in the blink of an eye, two lucky defensive plays, a special teams score and a missed Neil Rackers FG later, the Bears are still undefeated.What Monday night’s game showed me is that the Bears are not invinceable. In fact, they may not be as good as we all thought. They’ve played…