Elder Primal?

[Kaiser-Ace]

Ok, so maybe they aren't all Elder Primals then. Corvinoobus did say they left it broad, so maybe Bismarck is an Elder Primal, though the Vanu Vanu made it sound like his appearance was new.

I recall Elder Primal specifically meaning that tge primal has been worshiped for an exceptionally long period of time. Thus why Bahamut is an Elder Primal and Phoenix isn't despite Phoenix over powering Bahamut. So if the Primal has only recently been summoned it's not an Elder.
Though my theory for Eikons is that they, uniquly, dont require a summoner and can, to an extent, summon them selves given the aether and time to aquire it. See Odin Trial CSs for an examples.