This is the core of so many arguments I’ve had on this site, to the point I don’t find it useful to even discuss much. We are still based in a 4 man rush like practically everyone else. Alex Davis just doesn’t have his hand on the ground. We will go to an even front with something like Stille/Khalil inside with two OLB and it’s functionally no different than in a 4-3 defense under the same conditions. We may bring 2 OLB down into a 50 on first down, another team may go to a 4-3 under front. When you hear Tuioti describe what he wants in body types, he wants a nose, an under tackle (like a 3 tech), and defensive end bodies (he differentiates the two sides by body type). Chinander doesn’t refer to this as a 3-4 because it’s a multi-front defense.
We may be arguing semantics at times, but I (like many) don’t use the word blitz unless it’s more than 4 rushers. I’ll tend to not use it at all, really, and just refer to an outside rusher as an edge rusher to avoid confusion. So what I would consider a base rush already has one OLB with pass rush responsibilities. Right now, that’s guys like Alex and Nelson.