If this theory is correct wouldn't that imply that the Inchoroi only became damned after they came to Eärwa? (I got the sense that that's what he thinks anyway, but I could be wrong.) That contradicts what Wutteät said at the end of TWLW.
I don't think he addressed that in part II but I'll have to reread it.
On a side note, I would love to hear Thorsten's thoughts on the Inverse Fire and the White-Luck.