We ditched Joe Barry because we didn't like his Fangio scheme.
So, we're gonna bring in the originator of the scheme?
No. The Fangio tree is withered and he's the only one left. Let the Eagles die on that hill.
There is nothing inherently broken in "the scheme." And if you follow Fangio back through his lengthy history in the NFL, you'll find that his defenses aren't cookie-cutter.
There are always fad schemes in the NFL. The reason why some guys within the fad continue to succeed while others fail is that some of them are architects who understand it all from the inside and can evolve it over time, while other guys are journeymen who can install what they learned somewhere else and then it works or it doesn't.
Besides, Barry isn't a Fangio disciple. He was billed that way simply because he spent one season prior to GB hiring him with Brandon Staley and he has used a lot of 2 high shell (which the entire league has...).
He cut his teeth under Monte Kiffin and the tampa 2.
The rest of his time in the NFL has been spent primarily under John Pagano and Wade Phillips.