If 'human is always animal' is necessarily true, this necessity derives from the essential properties of actual individual humans, making appeal to a common nature explanatorily redundant.

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Necessarily true(describing the kind of truth the statement claims sentences can have): True in all possible situations or worlds; impossible to be false (like 'all triangles have three sides'), unlike contingently true statements that could have been false.
common nature(Scholastic metaphysics of universals): A nature (e.g., human nature) considered apart from its mode of existence, which can be considered absolutely, as it exists in the mind, or as it exists in individuals
essential properties(Constitutive of a thing's individual essence): Properties of a thing that it cannot exist without
explanatorily redundant(suggesting the Future Hypothesis doesn't add anything useful if we already have a better explanation): Unnecessary for explaining something because another explanation already does the job better.

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