Donavan beating Jedah is not really canon, it is speculation that it happened after Jedah fought Demitri with Pyron's power, and sumthin else about it, is that this was a super duper Donavan going by the name of Dee that is not not a Dhampir, he is a full Vampire. He was already 3rd strongest being on Earth behing Demitri and Morrigan, now his powers have at least doubled after he gave into the power of the dark. Once again, this is not concrete, this is speculation.