I didn't said that I had theories about it being someone else. And of course they had to explain every single details, in my opinion the point of the episode wasn't to shock everyone else with "who is the killer", it was to show "why" and "how" everything happened. I know that for some people who found it was obvious…

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I see so many people saying it was obvious that it was John, but until the last minute the same people had theories about the other characters being the TCK. Better it being John, with a really good and well-founded explanation, which has linked all loose ends, than say it was, whatever, Liz Taylor… only by the…