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No, you can take the formation by itself, but then it won't get the command benefits from the decurion. If you take it alongside a combined arms detachment, you get the command benefits for the formation on the models within it, but it doesn't count as part of a decurion unless you include it in one for its command benefits.
In short, no, you can take a destroyer cult by itself and gain the destroyer cult benefits for those models.
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