Ok. Bare with me.
I think Kreia is Bastala.
1. "I was the last to train Revan." she says to the Exile. Didn't bastila train Revan last?
2. That would xplain why she wasn't on the list of jedi.
3. (far fetched) that may be why she couldn't walk on Korriban. That ( besides t3's little message) is the only time shes mentioned! The only time she's not around.
4. She could look old from evil. Like palpatine.
Just thought id point that out.
You only fail if you stop trylng.