User blog comment:Vorred/Theran - Theories - Happy Holidays: December 2013/@comment-958607-20131225231724/@comment-958607-20131225233056

That could just be a reference to her title, not her species. :P In the time that Matoro was inhabited by Teridax, was Matoro not a Toa? :P

But, yeah, I see your point and I acknowledge it is a legitimate one. My guess for Vastara was a stab in the dark and, like I said, it's not really supported by any evidence, just a gut feeling. :P