More eyes can be better, but unless everyone's specifically trained to do so, more often members of larger groups get lazy and rely on "somebody else" to do it.
Then, as mentioned, more people make more noise, might be more inclined to talk to each other, and so on. Of course the larger the group, the easier it is for somebody else to spot them, unless again they're specifically trained to keep proper spacing, only communicate with hand signals and so forth. Even then, it's hard to hide a large number of people compared to an individual.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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