To say you shouldn't pick random people is wrong. I hate making this comparison, but look at Little Mix; they put the four of them together, and they happened to work out so well! My issue is that 5H was originally a much more pop group, but let's face it, it's likely L.A. Reid who probably made them lean to a more urban sound, and they've got their formula now, so why change what's comfortable for them? With 1D, it was Syco Music who tried to manufacture and over-work them all the time, which is probably why it was also a pain to be in the group, etc.