First Post, so please mind any mistakes or anything wrong.

Anyhow, I got a little theory for the future of Stormblood:

Zenos at the end of 4.2 is the one and the same Zenos, no clone or fake. He survived his own suicide because the Garleans got to him before we could get rid of the corpse.

Anyways I believe that Zenos will be our unknown "ally" through out now and the rest of the securing the stability of the two Nations storyline we got going on. Crippling and sabotaging the Garleans attempt to retake or sabotage or whatever they want with the two territories. He Does this all in an attempt to prevent the Garleans from beating you, his only "friend" and enemy. Eventually this will get him to have one final confrontation between you "two" (as an 8 man trial of course) all so he can have his one true thrill, and go out the only way he would want, defeating you or being defeated by you.