Well, it's going a little beyond Rohde et al (and could be an interesting future paper if you're into writing papers), but I would imagine the same sort of mode

Well, it's going a little beyond Rohde et al (and could be an interesting future paper if you're into writing papers), but I would imagine the same sort of modelling would probably show that it's unlikely for anyone to have exactly one line of direct descent to an IA point ancestor. Anyway, on the fun side of things, if you think of it in terms of ancient prophecies (the ancient prophecy says the chosen hero shall be a descendant of X), such prophecies usually don't distinguish between 1 line vs. many :)