mEn In Black
I’ll try to keep this simple because my theories tend to become a bit tangential(like the show).
Thesis: The Man-In-Black/Nemesis/Esau/Insert-Nickname-Here, is either part of a group or he can somehow separate into multiple entities.
1. John Locke enters the cabin to find Claire & Christian Shephard having a tea party. Claire has just left her 2 month old baby, Aaron, in the middle of the woods, and doesn’t ask Locke about Aaron. Claire is smirking, Claire is laughing, Claire is everything BUT worried about her baby. Either Claire has had some sort of mind-blowing epiphany which renders the life of her child insignificant….OR, that isn’t Claire. So we have Christian(which I think most people would agree is NOT Christian, but a Yemi-Phlocke-like entity), and a SECOND entity, having a palaver, somewhat enjoying the fact that Locke has been ‘chosen'(i.e. you’re easy to manipulate, you fool).
2. Rousseau’s Expedition Team follows the armless-Montaud down into the dark chamber. They emerge and Rousseau believes they’ve changed, somehow infected with a sickness. Her fears are confirmed as Robert fires upon her, thankfully she saw it coming and had removed his firing pin. The important tidbit: That was not Robert. The more important tidbit: the other two expedition members laid side by side with bullet-holes in their chests. Rousseau clearly suspected ALL THREE members of her team and shot them in turn. It’s impossible that MIB hopped from body to body as they were shot because clearly they were all taken/carbon-copied/possessed/infected/whatever when they went into the chamber, simultaneously. THREE IMPOSTERS walking around simultaneously.
The Following points are circumstantial at best, and hopefully you can consider them without them underminding the first two well-substantiated observations:
3. The Blast-Door-Map gives The Smoke Monster the name Cerberus, a three-headed mythological creature. Of course, they might only be connected based on their purpose, but perhaps they are connected based on their functionality….both being three-headed beasts, one literally, the other metaphorically.
4. I feel silly typing this, but the boars who were raiding the fuselage were looking for bodies. How many boars? Three. Flimsy at best, I know, but the shot of the boars leaving the beach and entering the brush seemed a bit gratuitous and poorly timed to me, there’s always been something a bit peculiar about that shot(I’m an editor/filmmaker btw, these things stick with me). Also, they were looking for bodies, i.e., hosts.
5. Vincent is so peculiar during the first several episodes, and sure, I know EVERYTHING was made out to be more interesting and mysterious than it would ever prove to be, but Walt asking if Smokie was Vincent…is that supposed to highlight the naivety of a young kid(who happens to be clairvoyant) by having him ask a foolish question, or was it an obvious hint from an insightful source? In one of the Missing Pieces Mobisodes, we have Christian(who we have reason to believe was MIB) talking with Vincent before Vincent wakes up Jack in Pilot Part One. Why would Fake-Christian be talking with Vincent? Complete speculation here, but maybe they’re in league together and Vincent is really Fake-Vincent. How could Walt interact with Vincent and not know it was MIB, since Walt is clairvoyant? Simple….the real Vincent who time-hopped with Rose & Bernard will most likely die on the Island, thus his host-body is available to be used by MIB, while the living-just-crashed-on-815-Vincent is running around alive & well. 2 Vincent’s, and MIB gains the ability to mingle amongst the Losties and gather intel.
I’m sure most of you will respond to the last several points but try to focus on the first 2, I believe it’s near-indisputable that we’re dealing with either multiple antagonists or a MIB who is capable of controlling multiple bodies simultaneously