Very interesting, I hadn't even thought about Ascians having a Primal of their own. Maybe Travanchet took the Limsa Horn because the Horns not only work on regular monsters such as Goobbues, Coblyns, and Sea Serpents but also on Primals. But then of course I have to ask, why the Ascians didn't take the Ul'dah horn as well, since Corguevais clearly had a shadow.

When the Ixali came to Eorzea, they already worshiped Garuda. So Primals aren't a recent concept (summoning them may be) and they clearly have a deeper history than we currently can know. There could be an unlimited amount of Primals and they all feel some need to attach themselves to a group of beings, so the idea that Ascians, Garleans, and the 5 Races have Primals as well is easy to make. But you would think that the 5 Races would each have their own individual Primals as well and they just may, we'll have to see.

Very interesting theories being brought up, thanks.