Did Gherman do the deed with Kos?

So, we know that the hunter's nightmare is Gherman's nightmare, and that it began from something the first hunter's (him included) did. A child comes from Kos (the orphan), and obviously looks a bit too human. We know Gherman's a complete deviant because he made a pleasure doll of his student Maria, so could the Orphan of Kos be a lovechild of Kos and him? Just my own wild theory, probably some plot holes but wanted to know what y'all think.