Didn't bother reading much, but...
"..no he's black, those things that make him look "white" are those lights"
No, he's white, those things that make him look "black" are those shadows.

j/k
"was infested and made a protoss/zerg hybrid."
Without Kerrigan's permission or knowledge, I might add, and since he's one of her higher ranking people, I'd say it's pretty damn likely she knows everything he does, and when...
unless... *gasp* he's only pretending to be infested, because he's immune to it or something!
Notice how the Zerg merely scared the Xel'NAga off(and destroyed most of their fleet), but did not absorb them?
The technological

the Xel'naga had could have made the Zerg perfect both in Form(Protoss) and whatever it was the Zerg was, thus makingthem the perfect race.
But, they chased after the Protoss trying to infest them.
So probably, they can't infest Xel'naga, and the Xel'naga, having made the Zerg, know how to make it seem as though they're infested, and Duran is a rogue or something trying to finish the experiment and ccreating perfection.