Saints hire Terry Joseph and Kyle Wilber

Rouxble said

Important to note that the Fangio defense doesn’t necessarily play in a two-high shell, the signature of his defense is to be in one pre-snap. The safety that rotates down for cover 1 or cover 3 has the advantage of playing from depth and seeing the play develop in front of them, and that puts them in a better position to disrupt a lot of dig routes and crossing routes that have been a headache for our defense in recent years.

It’s also advantageous against teams that want to run a lot of play action, because the QB will see one thing pre-snap and then see something completely different when he turns his eyes back downfield.

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Yeah, I should have been more clear, it's a two high shell look but it often involves one Safety or the other crashing the box just before the snap to put another guy in the box for run support. The entire scheme is an advantage in confusing the QB, against play action, and against running QBs since the DBs generally have their eyes toward the QB instead of on a guy in man coverage down field. The moving Safeties also probably make RPOs less effective since they may not be getting the look they thought they were getting. All this is why the scheme has been so effective against the modern versions of the McVay/Shanahan system and running QB. Combine that with the 1 1/2 gap on the DL and you theoretically have an answer for any offense if executed properly.