didn't the original confusion come in the gameplay.. Blizzard modelled the priest class after the Light really, and then shadow thinking of the forsaken or added it tot he forsaken...
but unable to show or create completely different trees for other piresthoods so as to not be confusing, they were given the same thing and each religion was given 1 unique spell
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After readinh the RPG books, how the "light" worked or related made a lot more sense, I noticed that chronicles changed aspects of that with some amendments to that, but it also clarified much of it too and adds to it, The light being an actual force now, but something you also generate from or tap into from within. Origins wise you essentially come from the light, that is the life essence of all sentient beings in the Great Beyond, and it's possible to add that the spark of sentience is from the light although that's a leap from me.
I don't know how that ties into the titans and other beings, but Chronicles was quite clear that the titans are at thet op of the from light based beings, beings like the Naaru while pure light embodied are not quite at the level of the titans.
It doesn't mean that Light is mutually exclusive iwth arcane or other aspects, in fact quite the opposite a sentient being can draw on bits from all of those, majoring in one or the other or sevearl - at least that's how I interpret it currently. Still a lot of mystery there.
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I'm not sure I follow, I quite like it, but then I read Illidan the novel and saw it presented in its proper context as opposed to reading the leaked excerpt.