Living in Eagles territory, I have the inside info on much about their team. On defense, I don't think they are really formidable or invincible, but they can be emotional and they can play way above or below their normal ability depending on momentum. They are all about momenum. Offensively, but even more so defensively.
There are certain places they are vulnerable for sure. They are not a dominating defense like Seattle, Carolina, or SF or like some earlier Eagles defenses under Jim Johnson. Every opposing team looks to the most vulnerable position on their foe and on the Eagles it is clearly free safety. Currently, Patrick Chung is their starting FS and he is mediocre at best. He has not been the stopper the Eagles had hoped for after being released from NE and playing there only 2 seasons. a I don't think he's ever had an Eagles game where he was their standout player. He is not usually their starter. This season Earl Wolff, a rookie, started the first 10 games.
But, Earl Wolff has been injured. Now, he is their big hope. And he has some talents. But he was their starter early on and played when they were 5-5 and then got injured after 10 games. He hasn't played since Nov 10. He tried to play last week and it didn't happen. Patrick chung has not played well and Brees should be able to pick him apart.
If Wolff tries to play, advantage Saints. He is not used to the pace of play in regular games and he is coming into a playoff atmosphere after sitting for 7 weeks and I just don't think he will rise to the task in his first playoff game against a QB like Drew Brees. Since Wolff has been injured , the Eagles have been very thin at safety.
Either way, Chung or Wolff, I would be surprised if Brees doesn't look that way and target that position early and often. Jimmy Graham presents a matchup problem with any NFL safety, and this should be no exception and I believe there are other Saints receivers as well that can take adavantage of this situation.