Spoiler: showPretty sure that's Gaius who's portraying "Shadowhunter" just based on the zoom in on his original mask? unless I'm overthinking things. Still..this story's ramping up.
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Yes, pretty much guaranteed that's him
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Most important thing is that he talks about how he "lost his place on the stage" etc. which is the exact type of crazy poetic dialogue that Zenos is fond of. Not to mention his katana. I'm just super stoked about Gaius coming back. I've been saying for years that he never died, we've had little threads of evidence to support it too; think about the DRK quest where you are forced to face everyone you've killed... Gaius never shows up. His body is never recovered, nothing is ever set in stone about Gaius being dead. NPCs don't even reference him anymore after Praetorium. Figured he'd be coming back soon after the ending cutscene of Stormblood.
in regards to the 24-man (sorry if it's been mentioned - I'm still avoiding MSQ spoilers):
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At least that's the vibe I've had from their relationship.