I’m changing my vote to: “Mr E” isn’t a person at all.
We all know skritt communicate with each other, and that makes them smarter when they’re together, right? Well, what if there’s a slower version of that, too? Ideas that sort and sift through them, like a meme passing through a group of people. Something happens, and it clicks on some small level that “this is important” or at least “that’s kind of interesting or odd”. So, when they meet the next skritt, it gets passed along, and they pass it to others.
The information changes and grows as it passes along, possibly encountering other “odd” bits of information traveling in the same way. Ideas fit together, and little bits of seemingly unrelated information fit together and suddenly, out of nowhere, comes something major.
Now, the skritt that has this happen in his head may not know WHY they’re suddenly doing something, and in fact that may even make them forget all about their actions later. But for that moment, the knowledge is there, and they act upon it. Maybe it makes them send a letter to someone. Maybe it makes them grab someone from behind (if they’re one of the larger skritt), and whisper something in their ear. Maybe it makes them drink a potion of human transformation and go into a cave to observe events.
Mr E can’t be tracked and doesn’t come forward because there is no “Mr E”. It’s just a very spread out and slow hive mind at work in countless bodies.
