I look at the rankings like a Pyramid. With A stuff being at the tip.
But, I think that Arvell Jones page is a good conversation piece for this thread, because it gets to the heart of how you define this material. Just from a purely objective standpoint, that Cap page is great. It has everything anyone would want in that kind of a page. It's got self-contained dialogue that does not need to be explained. It has a big Cap image of him punching the Red Skull (his arch nemesis) in a mirror image of his Hitler punch from the cover of Cap Comics #1, and some additional fight panels pages. It's well-rendered, and actually is pretty dynamic. If this was Zeck, or even Sal Buscema (not even listing Kirby here) it would be at least a low 4 figure page, no question in my mind.
This would be true regardless of the storyline or title.
Now, on the positive side it's from the mainline Captain America title, albeit from an Annual. On the negative, it's by Arvell Jones, who is admittedly no better than a C list artist in the hobby (although he does have some fans). But, I actually think this is among some of his best stuff (and I've seen qute a bit of it because he does a lot of the conventions in Michigan). But, regardless it's really good -- for Arvell.
On the positive: It has word balloons, and is pretty clean as far as the art goes. (I've seen the OA). It looks really nice in person. A Cap OA collector might see this as a really great example that they could hang on the wall.
Now, it's not "A" art, which I freely admit. It may not even be A art for Arvell (which is limited to probably his early Misty Knight pages). But it's definitely high B level - for him.
I think it's fair to say that this is an overall C level Cap page, but only because it's Arvell. If this were Zeck, or Sal, then it would be a solid B, IMHO.
All that said, I still didn't buy it because the asking price was too high (in my mind). I have no doubt that heavy hitters like Gene (understandably) don't think this page rates. Gene is collecting Dave Stevens covers, and the like, so his standards for what constitutes A level and B level are at a different stratosphere from the ham and eggers like me. A Killing Joke page - ANY killing joke page - is an "A" page to us, because it's way out of our league. Now, in the hobby as a whole, maybe that's not true. But it depends upon where you sit.
In any case, that's just my two cents. Your mileage at vary.