One suggestion I have seen, vis a vis Anakin, is that the Dark Side won the Duel of the Fates with the death of Qui Gonn. Sure, Maul [kinda-sorta] died, and Obi-Wan "won", but Obi-Wan wasn't equipped to deal with Anakin, to train him well, whereas Qui Gonn was. Had Qui-Gonn survived, he could have guided Anakin through his tribulations. But he did not, so Anakin was left with "brother" Obi-Wan instead of "Father" Qui-Gonn.