Board Thread:General Discussion/@comment-5920426-20130620025515/@comment-5527544-20130817024854

Thanks Muhammad, also I forgot this, but it was stated in the Episode with Gijera and hinted with Daigo's first conversation with Yuzare that the Ultras left because of Gijera's corruption of humanity, so the Ultras left before Gatanozoa attacked. The Ultras didn't interfere with human choice and when Humanity chose the Gijera flowers they tied the Ultras' hands. It makes sense that they left a statue for their human descendants to find, as a human, even as an Ultra they would be the exception to that rule.