From: Takfloyd_mkII__ | #007
Billy Zane brought something special to Kingdom Hearts, and it's incredible how such a memorable villain as Ansem could become so dull and forgettable just because of a voice change.
While Billy Zane did an awesome job as Ansem, no, that wasn't the reason why he fell off the radar as a villain, he just stopped being important altogether (much like Xemnas) when the central villain of the series turned out to be Xehanort.
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Oh brilliant blade of cold as steel, rend the infinite darkness and crush my enemies to nothing... SAVAGE WOLF FURY