I am not so sure of all of that. Several of our pond spawn koi, or at least I believe they are koi, started out as a light brown, with an even lighter, almost tan sides fading to white bellies, and now are VERY black on top. I get confused by some of the names... Matsuba... I may be using it incorrectly... where the top and most of the sides are black... I have several like this, with heads varying from white, grey, and yellow... This same color pattern again, on several.. The black is VERY BLACK. That said, with this same color pattern, I have a variety of scale styles... Some have tiny, every day scales that you see on most fish... some have huge scales... I have a horrible time trying to get pics in the QT but will go try to take a couple...
But also, the koi who were spawned in QT were ALL yellow til about half an inch or so. The orange is JUST starting to come in, as well as minor dots of grey (if they follow the basement fish, those grey areas should go black) and white spots on a couple just started recently (same white spots both moms had). One mom is a hana shusui, the other is an orange Matsuba that looks a lot like the hana shusui.... Dads are an orange matsuba, 2 light blue dotsui, and a dark yellow... another dad that got into the chase part time, I dont know his color name... each scale is deep brown to black, when the light hits him just right, he almost looks copperish... I have one baby that is starting to look like him...