What you say could be possible based on Donkey + Horse = Mule genetic manipulation could also be transmitted via Human + Sasquatch = that Englishman. It could be, I remember reading long ago a fictional story of a society of Neanderthals invading small towns in remote parts of earth interbreeding with humans giving birth to Apelike human capable of speech with technological abilities. Then about a year later the Hollywood movie Planets of the Apes with the spin-off into a another dimension of accidental future time travel hits the screen.