How much wood would a woodchuck chuck if a woodchuck could chuck wood?
Oh, sorry. Um, why, strictly speaking they would all belong to the same species. Good thing that's not the case here, else you'd have scored a debating point. >:-)
You are the one making the definitions. I was trying to give relevance to this "they will never be able to get transmitted back to the parent species." , in light of this "if the new species cannot interbreed with either of its parents". You are saying the "if" is not necessary. That makes the first statement superfluous.