I knew about Zion's comment and it makes it hard to know who is being truthful. Frankly it may have been hasity to accept that Kain is dead but given that a lot of slup and griefering creators are never forthcoming, I am more liable to believe people who are not Zion atm.
That said, if Kain comes out to reveal he is still alive it would proof Zion right but as of now. Kain is likely dead or at best wants people to think he is since he has left the H-art scene, which I can understand if that's the case given that there is a sigma in being fans of this kind of content.