Thus demonstrating that a sort of species selection can exist, because species can’t breed with each other and therefore can’t be infected by SC genes from other species, while group selection can’t exist, SC always infects.
That’s technically true, but it doesn’t help a lot. You’re assuming one starts with fixation to non-SC in a species. But how does one get to that point of fixation, starting from fixation of SC, which is more advantageous to the individual? That’s the problem.
In orchids (at least), not only between-species, but between-genus breeding has place. And species like Epipactis helleborine have flexible approach to SC/SI.
Thus demonstrating that a sort of species selection can exist, because species can’t breed with each other and therefore can’t be infected by SC genes from other species, while group selection can’t exist, SC always infects.
That’s technically true, but it doesn’t help a lot. You’re assuming one starts with fixation to non-SC in a species. But how does one get to that point of fixation, starting from fixation of SC, which is more advantageous to the individual? That’s the problem.
In orchids (at least), not only between-species, but between-genus breeding has place. And species like Epipactis helleborine have flexible approach to SC/SI.