This is not to hard to answer. First off the smaller the group the less likely they are to be discovered. Also maximum effect with minmum effort. UBL using a minimal amount of people was able to destroy the center of capitalism for the world. So to me it was impressive because they managed to do so much with so little. Whoever hatched the plan was deffinatly a criminal genius.

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Man who go through turnstile sidesways is going to Bangkok.