To me it feels like the one thing that made the gorosei feel so overwhelming is already being dealt with so they just don’t have any hype moving forward. And with a HK stated to be shanks’ approximate equal that even creates a Luffy opponent.
I just don’t see what the manga gains from just bringing in more fodder holy knights when Sommers and Killingham have been bad enough.
Their healing isnt really the only problem, you have characters like Saturn that, to a degree, could still put up with Luffy combatively and he was presumably the weakest of the 5 given what we saw. The fact that Luffy's hand hurt when he hit Warcury is a fucking problem lol. I dont see how the current roster in Elbaph deals with any of them. This is why I dont see any of them losing until the final war because clearly these characters are not reserved solely for Strawhats.
On the flipside, adding more Knights at least makes the goal attainable to winning at lets more of the crew fight to a degree, even if most cant kill them. You let Luffy fight potentially a Shanks level character, and conversely it gives us the opportunity to see if there are better Knights then the 2 jokes that are on Elbaph.
That to me feels like normal progression from Egghead, because it resolves something without resolving everything.
Edit: That said, Im not saying I expect any of this, I just want/wanted it to happen to give us some level of resolution over the past 2 arcs.