I personally don't want it to be Gaius, though having him involved would be cool. But, that being said SE does tend to be heavy handed on the hints when it comes to big reveals. Although, what a Primal was still confused people until HW cleared it up: even though the hints were there since 2.1, and given again in 2.4. Also what an Eikon is compared to a Primal still confused some people... maybe those hints arent so heavy handed, lol.