OK I have to toss my theory posted above out the window, where I was hoping that once you get to a solid color confetti fur, you can gradually breed out all the genesis furs (both berry and regular). Eleanor's picture of 2 appleberrys making a genesis domino is very clear. Sad, but clear. Thank you Eleanor!
And thank you Tad for the dice toss example, I've got to stop thinking of these 4 furs like the layers of an onion, with furs stacked from most recessive to least recessive, and embrace the randomness of it all lol.
I think I agree with other posters that these confetti kittens are a more difficult breeding scenario, much smaller chances for results in the same amount of breeding time. MAYBE we will discover that the confetti's breeding span is 4 times as long as regular!! Or some other neat breeding feature to compensate... Who knows