[Kiwami]

I think the twist they're building up to is that Emu was the host of a unique virus that was genetically engineered into the Bugster virus, making all of the Bugsters his brothers and sisters. That's why he doesn't need surgery to use Rider tech and why he seems immune to the game sickness, he was the first human to build up antibodies against it.

I think the doctor who saved him smuggled the virus out and it was experimented on by the ministry of health until it broke out. Maybe Genm Corp. was involved in some way, I don't buy the whole "they just appeared out of a glitch one day"-thing.

Of course I'm telling you what I would like to see happening, what I expect to see is that Emu is immune just because he is or because the doctor infected him on purpose.