Sober's argument in 'The Nature of Selection' establishes that species have real intrinsic population-level properties (e.g., mean fitness) that ground sameness of kind without requiring individual universality.
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intrinsic properties(Contrasted with structural properties revealed by physics)
Properties which supposedly underlie and account for the structural properties of things.
mean fitness(as an example of a population-level property)
In evolution, the average ability of all members of a species to survive and reproduce—a measure of how well a group is doing overall.
population-level properties(describing what Sober argues species possess)
Characteristics that describe a whole group of organisms rather than any single individual—for example, the average height of all humans, or how many members a species has.
sameness of kind(as what is explained by population-level properties)
What makes things belong to the same category or type—in this case, what makes individual organisms count as members of the same species.