We also don't know the HK ranking system, which could help us predict the battles easier.
In what way? Sanji has faced higher ranked, equal rank and stronger opponents that Zoro's before.
For what it's worth though, I think Sommers is the most senior Knight there.
Anyway, for now HK still don't seem very impressive, they were wrecking havoc against tied Loki, fodder giants and semi-fodder SHP, but we haven't seen them actually fight. Regeneration makes their fights less fun imo, but I still want to see what they can do, especially Killingham who for now is simply managing his nightmares but not fighting himself.
I don't have a problem with regeneration, I have a problem with how it's been implemented.
The Knights move with the impunity of immortals, and I have no problem with that at all in principle. There is a psychological component to letting their enemies hit them with their best shot and watch hopelessly as they regenerate.
The issue is really tied to how little they've
achieved done in the present or past timelines.
I don't fault Garling for losing badly to Rocks, even with help. Rocks wasn't at his peak, but he was in his prime fighting years. Likewise, I don't fault Sommers for losing to Rayleigh and Gaban.
My issue is we've seen the Knights take too many Ls in a condensed period.
I also think it's stupid they don't have Conqueror's Haki. All of them should. It should be something selected for, as potential Gorosei replacements. We should've seen these mfers do more aura farming in the present timeline versus giants, and in the past versus pirates. As it stands, even with the understanding Imu can beef them up, they've been undermined too much.