This assumption seemed to be backed up as well. For example, Bas' aurora blazed red while Liska was a pale shade of blue. Didn't that deviate from the white a regular aurora should have?
However, if they had seen Ri's aurora turn blue, would they really think this? Ri's aurora hadn't even been at 100% when it changed color, it had only just passed the 30% threshold.
At first, Dyon hadn't known what this meant. He could guess that it was connected to Ri's special soul, but there was no other information he had on it. In fact, even his master's memories had nothing, which is what made him think that it was a secret related to the destruction of the Celestial Deer Sect.
But, when he saw Bas' red array, something suddenly clicked in his mind. Bas was a beast! Ri was part beast! It all made sense.
Ri's aurora likely started off as white because she was part Elvin. After all, Grand Elders Cormyth and Kroak, despite being Elvin, both had white auroras despite being past the 40% mark.