It's actually funny to read all the things some of you say, Haralds complaint about the funny looking Magnhild, who by the all means should only be one profile, but since Remi refuses that path, he had to invent another profile... funny indeed.
Justin argument are somewhat also fun, it's like someone states that a proffessor can't be a professor because before that he was just a lecturer, and before that he was a student, and before that he was just a preschooler, and a preschooler can't be a professor, that we all know.
The thing about old genealogy are that it was almost always never written down in the purpose of being an explicit genealogy table, so someone almost later had to recollect all the pieces and put them together in a puzzle work, and for almost every specific family, someone had to be the first one laying that puzzle. By time some pieces has to be reinvented because of all the lost original sources, and here within lies the cause for all doubts, could that be true or not?
I would say that in most cases talking about medieval time, we find assumptions in almost every line, without major exception! I draw the line when it comes to proven or revealed commissioned works, to state that clear, fakes!
Can you prove that Munch or anyone of those others claiming this Isle of Man line as likely had such a purpose, of actually deliberately making a fake line?