Because no deities or angels gave Gautama Buddha any instruction , he didn't obtain a Guru Aura, but a Prabashvara Aura. This consists of a mixture of Sapphire Blue, Golden-Yellow, Crimson, White, and Scarlet. but is depected as being in stripes usually rather than a full mixture. This could very well indicate that he was/is a spiritual master (Golden-Yellow) who was very creative and talented (Crimson), who is as pure (White) as he is a leader (Sapphire Blue) and willing to change the world for the better (Scarlet).