Yes, I believe you've pretty much nailed the basic idea on the interbreeding. And once you accept that as a working hypothesis, you finally start looking through the correct end of the telescope.

There are numerous things, quite diverse and scattered throughout history and even current affairs, that are puzzling and even bizarre on their own but find a succinct explanation with the Anunnaki bloodlines idea. Why were so many ancient kings and notables said to be giants? Why do kings say they have the "divine right" and emperors say they have the "mandate of Heaven"? Why do so many claim to have descended from the gods? Why are the Elite so obsessed with bloodlines? Why did pharoahs wear the uraeus? Why is there all this serpent worship everywhere? Why are Jupiter and Moses and others often portrayed with horns? Well, it goes on and on.

You might like to give some reconsideration to the Bible. As I have been able to understand and "decode" it, it mainly concerns certain human interactions with the Anunnaki. There are many aspects of it which Biblical scholars simply wave away like that bad smell that can be explained quite precisely with an understanding of the Anunnaki and their relationship to humans.