More primals than elements?

[Eidolith]

Aren't there countless primals? In the 1.0 intro the aetheric seal beneath Silvertear Falls was destroyed and the primals were released in all those streams of light, though we were only able to make out some of the known ones.

Think as others have stated, if enough belive in a deity in Eorzea, it will manifest itself in the aether. The Twelve seem to be like that too, and they are summonable according to Lahabrea who tried making the young Ala Mhigans summon Rhalgr.

Off topic, I think it's cool that the masked man is named Lahabrea after the light scion counterpart of the esper Mateus from FFXII.