Originally posted by Heroism:
Originally posted by 9ersLiferInChicago:
If we do lose Ryans, and there's nobody on staff competent enough to step in and keep the system going, I say bring in a guy with a history running our defensive scheme to maintain continuity. Fangio is an excellent DC. But we have moved away from 3-4 scheme, and are doing quite well. We need to bring in a guy with a track record of running a 4-3 LEO, wide 9 scheme. That is not Fangio.
The 49ers haven't ran a base 4-3 under since 2018, so I'm not sure why that's even brought up. That's oooooold news, and we want nothing to do with that defense.
We had this discussion last offseason: nobody in the NFL runs this defense. This defense is unique to Shanahan's 49ers. This was one of the main reasons many of us felt Demeco was the best guy for the job because we could keep everything intact and continue to evolve it. The only other team that runs a base wide 9 is Robert Saleh. He liked it so much that he took it with him to NY.
I'm not going to sweat it until Demeco is gone, but if he goes, the next DC is likely on the team. I trust Shanny.
Granted, Ryan utilizes more of the over front than under, but he HAS run it, especially when D.J is on the field. And we rely more on the wide-nine alignment while in nickel and dime. But on base down, on obvious run downs, many times (not most of the time) I've seen DJ in a shade1 tech and 2-gapping (at least initially, then more bull-rushing to play the run while pushing the pocket), while Armstead is read-rushing (while in classic under he'd be 2-gapping as well). It's one of the reasons we've been so good against the run. That's LEO (under), just not a standard LEO. Ryans has been very good with timing his use of wide-nine and his unique 4-3 fronts.
Don't wanna get too football techie here. Getting late in Chicago. My main point is that the basis of Ryans' scheme is 4-3 LEO, just a very unique brand of it that I don't think the league has caught onto yet (which is Aaron Rogers was so confused to go with the ball). So if we cannot promote someone on the staff competent enough to run Ryan's system then we need to find a 4-3 guy who can. Not hire a DC with an entirely different philosophy and scheme.
I honestly think Ryans is still evolving his brand of 4-3 LEO/wide-nine defense, which is scary when you think about it, and why I don't think we can afford to lose him.

If you're looking at defensive assistants who have been here with Shanahan the whole time, its really just Ryans and Bullocks that are left with Holland stepping aside due to cancer.