whether you can summon a primal twice simultaneously seems like a bit of an epistemological question. the same person can't do it obviously, and maybe someone from the same society or with the same beliefs (pertaining to the primal) can't. but what if you had a society of amal'jaa that say, branched off 100 years ago and moved to meracydia? or longer? would their conception of ifrit be unique enough to have two different but similar "Ifrits" running around? i don't think there's a sort of 'Ifrit Aether' floating around in the lifestream- it's just sort of made up when it's summoned, without individual unique memories or a personality other than what the believers imprint on it.

there's probably an interesting story about people imprisoning a primal, then the next untempered generation comes around and say's it's fake, the allagans made it, and summoning it so the same one exists twice. then they fight i guess.