Board Thread:General Discussion/@comment-28911833-20160703050910/@comment-1458758-20160703171028

It's entirely possible. Being the God of Demons doesn't make Satan an expert on everything demonic any more than me being British makes me an expert on the history of the British Empire.

Besides, even if Rin was dead, what would that change? His body can still contain demonic power and that seems to be the extent of Satan's interest in him, as a vessel that can exist in Assiah.