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There is no team left in the playoffs that can stop the Saints. Any offense-heavy team left, the Patriots and the Packers specifically, would get dominated by the Saints defense. Out of the three heavy offense giants, the Saints boast the best offense and defense.
The Packers and the Patriots are the two worst defensive teams in the league and have barely any run game, while the Saints are merely average on defense and have one of the best run games in the playoffs.
Besides them, the teams that could prove trouble are the 49ers and the Ravens. Both teams boast the best defenses left in the playoffs. If either team successfully could stop the Saints offense, it would be a lot of trouble for the Saints to stop them on defense.
However, there is no team in the NFL that can fully stop the locomotive that is the Saints offense, and both the Niners and the Ravens have terrible offenses centered around the run. Blitzing often and forcing Alex Smith and Joe Flacco to make mistakes would be the keys of the game.
The other teams like the Broncos and the Giants are good teams in their own right, but would fold under the constant pressure that Drew Brees and the Marching Saints bring to the table.
The only way the Saints would lose is by pure morale—both the Broncos and the Giants are massive underdogs and the combined energy of making it to the Super Bowl or the NFC Championship game could lift them over to top.
But they can't soar any higher than the best team in the NFL.