Johnson didn't explain *everything*. He just provided little snippets of trivia in the world. Heck, even he didn't know everything about the world, if the story books are any indication. He was the Iwazaru of the game (or Iwazaru's established role, not getting too deep in HIS character). Only he spoke in a pleasant British accent instead of distorted Engrish.
Anyway, I may be unpopular for suggesting this, and believe me, I LOVE Killer7, but I honestly don't believe that Suda51 had a grand plotline of interweaving excellence and conspiracy that he's "holding back" while we try to make guesses analyzing and interconnecting all the various minutae. To be frank, I feel that he had a lot of ideas he smashed together and by some miracle, many of them could be successfully strung together given the proper liberties.
In short, I feel it's disjointed and ambiguous by design or due to constraints (time, budget), and any grand scheme we can put together out of the whole mess even on the most minute details was completely coincidental.
That said, it could just be the cynic in me (wow, me being more cynical than Yahtzee).
To that end, I feel that we shouldn't view Suda51 as a visionary mind screwer. I've always felt the best mind screws happen by accident or over-analysis and anyone purposely trying to do so in their writing will fail or show their hand too early.
We should instead see Suda51 for his design style, and what he obviously loves. Lovable characters, breaking gameplay conventions, pop culture, retro gameplay toss-ins, luchador of course, and pushing content limits.
EDIT: God, y'know even as I read over this, I'm reminded of Flower, Sun, and Rain, and the Silver Case, and both of those games were attempts to be mind screws, so maybe Suda really does fancy himself as a mind screwer and has just been reeling it in now that he's actually making money. Ah, who knows.