I've also not read "Maker of Dune," so this is the first time I've heard that. I can understand where he was coming from with regards to Luke vs Paul, but the common story they share is generic enough that I'm not convinced any court would find in Herbert's favor.

It does make me wonder if Biggs Darklighter is the Duncan Idaho parallel. Could you imagine an endless clone army of Biggs? Is Biggs the perfect man?