HK could conceivably mimic Revan's voice and might have figured it out so T3 had to stop him. The Revan novel furthers this notion, as T3 in search of Bastilla could not find her so searched out the next suitable person who would hopefully bring him to Bastilla. Ended up working out apparently.
Love me, I win.
Hate me, I win.
Ignore me, I've got exactly what I wanted.
Love me or hate me, you're still thinking of me either way.