Well since the first saga was made first (IV- VI) they didn't even know about Qui-Gon. The reason yoda had mentioned Qui-Gon at the end of episode 3 was because from episode I-III no one had been able to know how to communicate with the dead, and during episode IV Obi wan communicates with Luke. So for episode III, they wanted a way to explain how communicating with the dead first was learned.
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