You obviously have no idea what you are talking about..
First, Darth Bane was not in KOTOR.. he is alive about 3000 years after KOTOR 1.
Second, Darth Maul was horrible. In the Darth Plageuis book, we find out that Maul was just a tool for Palpatine and Plageuis. Palpatine only trained him so he could be sent to do things, and was never intended to be a powerful sith lord, merely a lackey.