To those denying Rhalgr can't be one of the Primals we will face, mind you that Fernehalwes has been dropping the hint that is very well possible. To the point, he said something along the lines of "well, imagine there's a deity with the name Ifrit in X, but this Ifrit is a benevolent one, instead of a vengeful one. Then yes, you can have a Primal named Ifrit that is much different to the one we know."