Quote Originally Posted by WyrahFhurrst View Post
Further, the blade is an Eikon, not a Primal. It's something more powerful than a Primal, though that could mean that Odin, being a construct of the blade's power, may actually be considered a Primal under the thrall of the sword-Eikon Zantetsuken.
We've already been through the distinction between "Eikon" and "Primal." You can go back and have a look at that link that was posted a few times. It has the Dev notes in it.

Unukhalai says there is a difference, but the Dev team has explicitly stated, clear as day, that the term "Eikon" is the just an older version of the word "Primal." The distinction between the two seems to be geographical (as Eikon was used by Allagans and Garleans); so, we can infer from this that when Unukhalai says he's referring to Eikon's that we are not acquainted with, the most we can assume is that they are from lands that we are not familiar with yet. Ie: we've never seen any Primals from Allagan history, save for Bahamut, whom they called an Eikon, and we call a Elder Primal, and we certainly don't know of any Garlean Primals, whom the Garleans would also refer to as Eikons as they adopted the term form the Allagans.