The Keeper of the Lake Elder primal

[Anonymoose]

Then it kinda adds a sense of Irony

Exactly! Though, one could argue that the irony exists regardless of semantics like whether primals or just aether (or a third option) were sealed. Either way, they achieved the exact opposite of their goals (and perhaps worse). Even Nael van Darnus' meteor project was steeped in that irony. "Just gonna drop this moon and there will be no more primals." <primal breaks out of the moon> "OH, COME ON."

Doesn't seem improbable that the Allagans where able to seal away lesser primals if they where able to contain and restrain Elder primals.

Not at all! Makes a lot of sense, even has some parallels. But here's the logical bottleneck for me: If the primals themselves, as individual existences, were sealed, then the Allagan sealed Ifrit and Titan, who were visible in the scene. That would make them roughly as old as Bahamut, and therefore they'd be Elder Primals - but they're not (inb4 theory that the Ifrit and Titan were actually Belias and Hashmal because Belias-egi looks just like Ifrit-egi). I can find a way around a lot of things, but I can't find a way around that. For me, it always leads back to the theory that the the primal essences were born into the aether of the beast tribes worship and it just didn't become feasible to summon them until the aetheric streams were warped by the breaking of the seal.