I CALLED IT! Who is the puppeteer!?!?

Very very slight Volume 4 spoilers ahead

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Hello anyone that reads this. A while back I made a post on this very forum involving the identity of the puppeteer. In that post, I entertain the thought that the puppeteer is not Roger(a puppet for all of those who have not read Finding Vanessa). I figured Roger was just a red herring... I mean, it was so obvious, a puppet would be the puppeteer right? But I speculated that the puppeteer could be someone else other than Rodger(Spencer or maybe Jerry).

In Volume 4, it is all but confirmed that the puppeteer is someone other than Rodger. A certain character talks about the "players in town" which were The Collector and The Puppeteer... However, there is a new name mentioned, "The Grim One". At one point The Grim One's name is revealed to be Grimorea or something of that sort. A few chapters later, Jack realizes that Grimorea is an anagram for "I am Roger", deducing that Grimorea/The Grim One must be Roger.

So with that in mind, let me first say "I CALLED IT!!!", and secondly, I would like to ask you all again, who the heck is The Puppeteer? Not to make any theories or anything, but just going off of points we can infer from all the books, especially the later parts of Volume 4, I expect that The Puppeteer is Spencer. He is just pulling a lot of strings to "Always be on the winning side". Does anyone else have any theories on who The Puppeteer is; Do you think Jack got it all wrong and Grimorea is not Roger, do you think that Roger is actually The Puppeteer because of all of the strings he has been pulling for a millennia, if that's the case, then who the hell is Grimorea?

I'd love to hear what anyone else thinks!