Yes, to his credit, Fuz acknowledges this in the 2nd edition of his Who Was Adam book. If I understand him correctly, at this point he argues (tentatively) that if they interbred then this was indeed bestiality. If that is so, then that raises questions about “humans” and “nonhumans” having the ability to interbreed. I get your point that, if this is the case, then the RTB model also has the problem of non-adamic “others”.