My brother recently proposed the following theory to me. I thought I'd run it up the flagpole and see if anyone salutes. There is a child by Rheagar and Lyanna, but it is not Jon Snow. Jon is the son of Ned and Ashara Dayne. Edrick Dayne is Rheagar and Lyanna's child and remains essentially aynomous. Jon serves as a final decoy to protect Lyanna's child. I recognize there are some flaws with this. The chief being Ned not naming Jon with his children, requiring vastly more co-conspirators than Jon being Lyanna's child, and needing a more devious brain than Ned's to conceive. That said, opinions?