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Saedigh's Lost Theory

I can't take all of the credit for this, Capt. Mike planted the initial seed of inkling in my brain. But this is what I think is going on, at least as far as The Dude in The Hatch is concerned.

Desmond, The Dude in The Hatch, is what Walt will someday grow up to be. Maybe Aaron will, too, but I haven't thought that far ahead. Desmond can make things happen. Not in a go-getter, "wow, that guy knows how to make things happen" sort of way, but in the creepy "I was reading a comic book about a polar bear, and now one has chased me up a tree" sort of way. Desmond's powers are so highly developed, that the only way he can be saved from himself is to keep him isolated underground in that creepy retro hatch. In fact, he's so powerful, he's capable of astral projection, and wasn't really there running stairs at the stadium with Jack.
The Others are responsible for keeping Desmond isolated, and are responsible for maintaining The Security System. When Desmond identified Walt as having the potential to be like him, The Others felt they have no choice but to take him, too.
Of course, this is totally based on conjecture, and I have spent zero time trying to find out if anyone else shares this idea, or has already debunked it. I do have a job, you know.