The real explanation is that Quiggy wasn't thought of until Episode I. But for a canonical explanation, Yoda had a very big influence on all the Jedi of that age, and instructed most of them. Besides, Yoda was the only other Jedi who survived Order 66 (Besides the others that went rogue). It wouldn't do Luke any good if Obi-Wan told him about Qui-Gon.
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