Zenos does look like a distracted red herring in all honesty. The way they emphasised that he sees himself as your "friend" (I had made a Golbez comparison before, but on reflection that's more Emet; Kain/Cecil may be a slightly closer analogy because of the rivalrous lens through which Kain viewed their friendship I guess) further suggests to me that he may change his tack later on. Not as a redemption plot or anything, but solely because Fandaniel threatens to rob him of the only thing he desires, meaning he could turn on him or whatever he is working with for that reason. Also, it's worth noting the stuff about the souls and moon is not in the German or French. There the focus is on his rage and hatred. He is a tool in the end, because Fandaniel is the one with the mystery background, and not him, end boss or otherwise.
Indeed, it'll make for a nice change of scenery. Apparently on the border of Dalmasca, so I doubt Gabranth will be offed any time soon. Certainly hope not, anyway! I also hope they tie all of it to the MSQ eventually and keep him around as something other than an antagonist.
I'm not sure if this has been posted yet, but this stood out to me when someone showed it to me...
With that said, there's quite a few options as to who it might be, and with Hades narrating the 6.0 trailer, I have to wonder...
No, it's definitely not Raubahn or Arenvald. Aside from the accent differing, the difference is starker in the other language versions, in some cases significantly so. Comparing to this it does sound like Estinien is a match:
https://youtu.be/jYvbihm8uQ4?t=29
I'm sure people more familiar with his VA in the other versions could also help confirm it.
I have to say I find Arenvald's excitable, higher pitched JP voice pretty funny in comparison to Yorkshire lad Arenvald from the English one. English Zenos definitely has the creepiest tone of all the voice acting.