And George Lucas says the opposite of that, so who cares about what Kreia has to say?
Apart from that, how could Kreia talk about the characters from the movies, when those happened almost 4000 years after her death?
She was obviously talking about everyone until KOTOR, though I don't think that she was all that consistent in her comments. If Revan was like the heart of the force, how would the ancient Jedi and Sith be that far ahead of everyone?
History always tends to glorify people who are long gone. I'd say Kreia is kind of guilty of that as well.
This does make sense, considering that the supposed "Grand Masters" of the Jedi from KOTOR II are pushovers (except possibly Vrook).