While the New Orleans Saints are obviously struggling defensively, and can't seem to find a way out of their funk, their inability to slow down opposing quarterbacks has been their true downfall in 2015.

As you can see from the Twitter post below, New Orleans has given up a massive number of passing touchdowns this season.

Now, those 35 touchdown passes allowed are seven more than the second closest team, the Philadelphia Eagles.

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Opponent QB rating against the Saints for the season is 116.6 (35 TD/6 INT). Youch. #nola #saints

-- Seymour D. Fair (@seymourdfair) December 9, 2015

When looking specifically at their recent four-game losing streak, you'll find that their inability to slow down quarterbacks has been a major downfall. They allowed Marcus Mariota to throw four scores, Kirk Cousins to throw four, Brian Hoyer to throw one and Cam Newton to throw five.

If there's any specific area where the Saints must focus this offseason, it's on finding a way to slow down opposing quarterbacks. Whether that comes in the secondary or bolstering their pass rush, their inability to shut down the position has cost them dearly.