oyceter and I both came up with the same idea independently upon re-reading the series, so I would call it a variant interpretation rather than fanon. It went right over my head when Yaone mentions it the first time, because we've never heard of Hyakugan Maoh at the point, and when he's mentioned later as Kanan's kidnapper, I didn't recall the name. But when I re-read the series, I went, "Hey! That's the same guy! I wonder if..."