"Because Maul doesn't use the high ground, he toys with Obi Wan, using the sparks from his saber. When Obi Wan leaps, Maul doesn't react, that's why the high ground was of no use to him. Maul had the advantage, he just got bitched anyways."

Agreed. Had Maul stayed on his guard, instead of dicking around, he could simply have cut Obi-wan's fingers and finished him off. As it was, he goofed off, and paid dearly, because it gave Obi-wan time to hone in his focus and abilities.

Again, overconfidence...