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So 610 can make togabito, which leaves behind a scar. This means, perhaps he turned the shiki leader into a togabito (he has the scar on his neck) - but that would mean that 610 has been alive for decades as well, because the leader of shiki and the scientist guy have been alive for a long ass time apparently. But that means the whole cloning himself and his daughter thing has also been ongoing for decades - which also means that his daughter met 610 decades ago (and of course their relationship is a mystery too) and died decades ago. Which on top of all that means that Jyugo is technically decades old too, and the most recent clone (15) might have been the last one? That part is confusing because it doesn't seem that shiki has tried to make more clones.
What is more confusing though is that perhaps Elf was meant to be an imitation of 610? Because when Elf infects others, he leaves a similar scar. Since Enki and Hajime were/are infected but they had nothing to do with 610 aside from being in Nanba around the same time, it means that that has to involve Elf and not 610. But why does Jyugo not have a similar scar? He's a host of Elf but even underneath the chains he does not have a scar. It's strange. However Shiki isn't actively searching for Jyugo, and it could be that Kaazu has a big hold on him, but also what is the extent of Jyugo's powers? He has the arm things and at the end of the series he can somehow teleport, so I wonder what's up with him. Anyways, I love this series, hope the author can continue it one day lol