Yes that maybe true, however Maul was a Sith nonetheless, he's only Advantage was the double hilt lightsaber, and Double hilts were extremely rare, pretty much a legend around that era... I'm guessing I mean who trains to fight someone with a double hilt? But anyways my theory why Qui-Gon lost to Darth Maul is: When up against A double Hilt lightsaber, just like normal duels you watch your opponents moves and predict it. The Double hilt is dangerous when your watching one side of the saber you have to watch out for the other side making difficult to fight against, especially for the un-trained or slow reflexes. Pretty much against a Master using two lightsaber. Qui-Gon judging from his LightSaber colour is a Consular Jedi, and die hard fans out there know that Consular Jedi are the wises and more force sensitive then any other rank. Qui-Gon lost because he was out match from the beginning, Darth Maul is clearly a striker. Qui-Gon die because he was out matched and when left alone he died. Obi-Wan defeated Darth Maul... Seems like stupid luck when he defeated Darth Maul but manages to go head to head with him because he was a Jedi-Guardian heavily focus of LightSaber striking. So in other words Qui-Gon was out-matched and out-skilled from the beginning. Yoda is different he's live for over 700 years he obviously master plentiful techniques... Trust me age doesn't matter... Darth Sidious and Yoda Proves that...