Once you get into the playoffs, almost any team in has at least a shot of getting hot and going to and winning the Super Bowl.
Look at the Giants in 2007. They were arguably one of the weakest teams heading into the playoffs. They got hot at the right time and barreled all the way to a Super Bowl championship.
You can make the argument that the Pats are currently the best team in the AFC. You can make it for several teams, but there are legitimate arguments for the Patriots. Which means they obviously have a chance for the Super Bowl.
But in an one and done playoff system, anything can happen. So even if the Pats were the clear best in the AFC, it doesn't guarantee a Super Bowl spot. I mean several of the Patriots teams that lost in the AFCCG were arguably better than one or two of the ones that won the Super Bowl.