I think all the confusion just goes to show that if key plot points of your story revolve around metaphysical gobbledygook, at the very least it should be clear and easy to understand. If you can't do that, then stick to things within the level of understanding of ordinary human beings (ie. your players).

I also completely fail to understand what is so "evil" about the gods eating souls for Source. As opposed to what, going to the Hall of Echoes where your memories are eaten until your soul dissolves into nothingness? That's different from becoming God Chow... how, exactly?

Between genociding the elves, to brutally murdering the people at the academy, to his plan to genocide Sourcerers, to his shameless exploitation of his worshippers and his plan to miraculously "arise from the dead", Lucian is the truly evil one here, which is not a thing I expected to say.

Personally speaking, I'm probably going to personally consider this game as non-canonical instead of Divinity 2: Dragon Knight Saga.