if reaper then Gaius

[Darkstride]

it just going be a katana has weild anything else. did you see any scythic amoung those weapon no. plus he insane become a ascian drove him insane there also other who think it be templar job, i supect at end of ffxiv endwalker we killed him

where in the lore does it mention reaper. you can claim in the palace of the dead i think yoshi p made clean we weren't going have any nermancer jobs

The weapon was actively hidden during the cutscene. That part of the room was kept out of sight. The camera angles show a lot of weapons but deliberately show little of the entire room.

As for what Zenos will wield, it will not be a katana. He specifically says "there is one that I have been meaning to test", and Fandaniel responds with "well well, not quite what I was expecting". That dialogue would make no sense if he just picked up another katana. He's choosing something new to him.

[Rongway]

Fandaniel responds with "well well, not quite what I was expecting". That dialogue would make no sense if he just picked up another katana.

That means nothing. Fandaniel could just as reasonably have expected him to pick up anything but a katana, because the room was full of various weapons.

[Darkstride]

That means nothing. Fandaniel could just as reasonably have expected him to pick up anything but a katana, because the room was full of various weapons.

I don't think they would bother to specifically bring it up in conversation at the end of a patch cutscene if he was just going to pick up another katana. The dialogue with Zenos has been pretty clear that he is looking for something new.