"In the beginning God created the heavens and the earth. The earth was without form, and void; and darkness was on the face of the deep. And the Spirit of God was hovering over the face of the waters." (Genesis 1:1-2)
Man's tool of classification is simply an attachment of belief.
That is it is religion like the belief in evolution which is based on fiath in evidence presented.
Here is a quote from the University of Waikato you refered to.
"Plants and animals both owe their origins to endosymbiosis, a process where one cell ingests another, but for some reason then fails to digest it."
Note the term used...but for some reason. This means that all information derived in such context is based on faith in previous related work and yet their is mystery and uncertainty in the said theory.
The Article continues to state speculation as fact...this is not scientific, because we know for a fact that the information regarding evolution is theory and while there is evidence, the 600 million year timeline, etc. has not been verified by rigorous experimentaion, that would take 600 million years to prove beyond the shadow of a doubt.
The information and theory are only as good as the words used to communicate them.
The fact that you had to placed your underhanded assumption of inbreeding into your premise says it all, Your argument is moot when it is integrated with a manufactured (straw man)insult.