User blog comment:Sosuke Aizen008/Who is the most powerful in stern ritters?/@comment-1904799-20130922174715

I don't think there's necessarily a way to rank them purely in terms of strength; a lot of their skills are more or less effective depending on what situation they find themselves in. Even if there does exist a ranking of Stern Ritter in terms of pure power, that doesn't necessarily mean that the "most powerful" is actually the biggest threat. It's a similar situation to that of the Espada; technically Yammy was "the strongest" because he was ranked as 0, but he didn't really pose the biggest threat to the main characters, as Byakuya and Kenpachi were able to take him out with seemingly little effort.

So if the lettering system does coordinate with "pure strength," that would mean that Haschwalth is the strongest of the actual Stern Ritter, disregarding the rank that Ishida was given since he's not really a member. I think that's kind of a risky assumption, though, because that would make Askin Nakk Le Vaar the second most powerful Quincy currently known. It would also mean that Liltotto Lamperd outranks Bazz-B in terms of strength, a claim that I find hard to take seriously. Of the Stern Ritter we've seen so far, I'd say As Nodt has shown himself to be the most formidable. His ability immediately incapacitates just about any adversary he faces, and he's shown himself to be absolutely ruthless and brutal in combat.