I never got that 'last jedi' thing. It would have made sense if it was because Kreia was an exile... but so is the main character, so there's not really an explenation for it.
Maybe it's what the sith consider the last jedi... and since the sith KNOW Kreia, then they know she's not worth it... and they think the rest of them are dead. Including Atris, Kavar, Zez Kai Ell and Vrook. >_>
"If God is a DJ, then life is a dance floor, love is the rhythm and you are the music."