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There is some significant insect damage on that plant, and also the one next to it. I don't know if the damage is random, of if there is something with those plants that made them more susceptible to insects. Often, the more healthy the plant, the less likely it is to suffer a variety of forms of damage. If it has an effect on the yield, it is less likely to pass on its genetics to the next generation. If it produces big, healthy cobs anyway, it is a sign that it can handle some damage and still pull through.