i remember reading something along these lines when I first read return of the jedi. Obi-wan explains how he meet Anakin and how he became darth vader. He went through alot more than he did in the movie. This timeline fits what he said in the book alot more than what Gl is passing as the prequel "story" at the present time. Hopefully, he sees the light and desides to redo the prequels the right way rather than messing with the OT yet again.