Quote Originally Posted by Februs View Post
The part about this that really gets the gears turning is the notion that Odin's true body is locked away somewhere else, and that only the sword was locked in Urth's Fount. If that's true, then it raises the question as to if Odin is, in fact, a Primal/Eikon at all.

This just makes me fall back to my previous theory that Odin is, quite simply, a Super Powered warrior whom, like the Warriors of Light, got so strong he crossed the threshold of attaining God-like powers (hence the term "Eikon" being applied to him). If that's true, than it's not even certain that the sword Zentetsuken is a Primal. The notes only refer to it as being "cursed" and having a corrupting influence.
Possible spoilers for those who have not completed MSQ.
Wasn't Zantetsuken brought to Eorzea by an au ra?

I have to think it's an eikon, and Odin is a primal summoned by it.