It doesn't matter what realm they exist on. High 1-A is infinitely above anything a 1-A can hope to be. It is Tier 0, just with a caveat that prevents it from being 0. You can have more than 1 High 1-A, but essentially even if those High 1-A's were above other High 1-A's, they would still only be High 1-A. It's the absolute highest you can go. The tiers can sometimes be misleading. High 1-A and 0 are about hierarchies. You can only have one tier 0 because it's part of their definition. By having more than 1 they instantly only become High 1-A, and can't be higher than that. Tier 0 is about being at the top of a hierarchy. High 1-A is about being boundless to all systems. As I've said, 1-A is a vaaaaast tier and encompasses nearly everything. Those higher tiers are more about hierarchical structure in an "outside," world such as that, and as such there can't be an "At least High 1-A". Even in the only case it would make sense (an unknown entity which *COULD* be a tier 0, but again, there could only be one "At least High 1-A", and there couldn't be a 0 in that situation) It really doesn't, because they're either High 1-A or 0 based on the definitions themselves.