As I recall I used the word "or" not "and" in my sentence dealing with kinds. In other words if a pair can mate, then they're a kind, OR if they have the same ancestor they're a kind. So an animal might not be able to make because of the extreme variations they have reached but they could be the same Biblical kind if there’s a common ancestor.
However, what I don't recall is saying that somatic cells do have an effect on offspring. Only defects in cells that do have an effect on offspring get passed on, you know that. It doesn't matter if a hereditary defect is added from external forces to humanity as a whole. Every time something is added it's slowly mixed into the gene pool, like a dye in water except it doesn't get any less potent as it spreads.