well, Sham, I think those who voted for Aftab's 6, will justify their selection by saying that if that aspect (aftab hitting the 6 at that moment) was absent in the match, BD might have just lost the game despite Ashraful's incredible innings.
Mind you, one of the options is "Ashraful's composure" while playing that innings, and NOT the innings itself. If the innings itself was a choice, then I think it would get the most votes, by far, because it truly was the match-winning innings.