Well looking back on this old trailer of 1.0

https://www.youtube.com/watch?v=mXDMDvYu0Fc

it has a much clearer view of the events that released the primals during Silvertear lake's Aether seal destruction and the Primals becoming free near the end.

So anyone willing to guess what are the other Primals beyond Ifrit, Garuda, Rumah, Shiva, Titan, Leviathan, Odin, and Bahamut?

The trailer clearly shows each light orb being released from Silvertear lake is a Primal.