Revan isn't his own fanboy while Kreia is his first and primary teacher.
A lot of people in Kotor seem to know enough about Revan to know his power, and the "comparison" was made some 4 years after kotor 1. So, within the story there is no definitive evidence that Kreia didn't know how powerful Revan was: she goes as far as describing him as the heart of the force after all (not literal), which gives you a good idea of how highly she rated him.
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No, she was calling the Revan she knew as the heart of the force, The question from the Exile
"What was Revan like as a STUDENT"
"Revan was power, Looking at him was like looking into the heart of the force." - Kreia
She is tlaking about her Padawan NOT the 20 something year old man who became 3 times as powerful as the version she last saw which she admits was at the beginning of the Mando War. There is definitive evidence and here it is: She hadn't seen him in 13 years. What other characters aside from Malak and Bastila about Revans power is here say.
What your claiming goes agaisnt logic, there is no way if I had a conversation with you 13 years from now you'd be the same person, with the same intelligence level, the same physical body type, the same views. You'd most likely be a completely different person who has changed with the years.
And before you even try to bring this up, she couldn't sense him either other wise she wouldn't have made the comment
"Why didn't you follow Revan" The Exile
"Why? Because I DID NOT KNOW WHERE HE HAD GONE" - Kreia.
Which also leads me to believe that Revans bond with Kreia wasn't even that strong and if anything the affection was very one sided. Revan constantly leaves Kreia to learn from other Masters while being her padawan. Revan doesn't think she is strong enough to help him, Revan simply uses Masters for their knowledge and moves on like he did with Kreia, with Zhar, with Kae, ect. He is the only Jedi I know of to have been whored out to so many teachers. And when he needed info on how to leave the Jedi he came back to the teacher who had the info.
Kreia did not know Revan.