I like this post, and also the previous post you had, HJ. I think you did a decent job listing some of the reasons he may have switched over. I will say I don't agree with you on LBS: at least a couple of the LB positions in a 3-4 are very similar to the typical LB needs in a 4-3, so I don't think we have a huge mismatch there. I also am not convinced we have a mismatch any more on our D Line with the possible exception of nose guard, which is why we hit the portal. As others pointed out, if anything, our more successful DEs tended to be weaker in the rush and end up in the league better suited for a 3-4 role anyway.
Beyond this, I agree with others who don't 100% understand why Fitz decided to make the change in the first place. I don't think we'll ever know. I personally really enjoy the 3-4 quite a bit and do think it can be shrewd to use it as a system that allows you to target a little bit different type of guy, which is maybe a good niche for NU. It probably is a good fit in modern football. Maybe we think we can have a better time recruiting lots of LB and large DB type guys than we've had recruiting elite traditional edge rushers. Maybe Fitz just got sold by JON on it. So I like a lot about a 3-4 switch, but it's also hard to argue we hadn't established a brand and a culture of success in the 4-3, which speaks against a change.
Either way, whether it was the right direction to go in the first place or not, I am happy that they seem to be actually implementing it this year, because what we saw last year was just so frustrating and confusing. Bringing in a 3-4 guy and running mostly the old schemes was just mind boggling to me, so I'm happy to see how we're looking to innovate based on the hire we made.