Similar to my own ideas: I don't think it was "organic" either, in the sense of buying pressure slowly building up, then being released. Looked like a single entity to me as well, only question is: why? Seems by buying gradually, you could minimize slippage, so assuming the original assumption (one entity driving this one) is right, I can see two reasons to buy it all at once, across exchanges: to "make a point" for the bulls, or to squeeze shorts. The latter didn't seem to work (so far), however, judging by the finex stats.
My question for those that have watched the markets is, how do shorts react to this type of increase. Do they get fearful of putting in more shorts or do they just think what goes up must come down and increase their short interest? Hopefully it's the first.