In b4 9/11 Conspiracies. And I'm not willing to go in that direction, despite mentioning it.
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But, a "what if" thread, huh?
So, the kind of analysis you're looking for can have a similar depth as this:
http://www.nfl.com/videos/new-englan...s-helmet-catch
Except applied to actual history. Well, lemme think about some Bizzaro Worlds.