To be fair, though, the actual justification given by Van Dine for that rule is that the culprit shouldn't be someone who would ordinarily come under suspicion, or in other words, someone who isn't "obvious". Considering the amount of times that the servants get suspected because of the master keys, making one of them the culprit DOES sort of violate the spirit of the rule. But in the end, Ryukishi repurposes a lot of the Knox/Dine rules, so it doesn't really matter.
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