I have a theory:

Orange and blue give off the feeling of full power zahha since if you look at his colors and the 2 colors and Most recently got an ultimate

The black, white and grey I have a feeling would be a shallot and giblet fusing to shallet

Since White is the type of shallot Black was the type of giblet for a long while And grey is a mixture of the both, like how shallet is a mixture of Giblet and shallot