Buttercup was a yellow chick. When she feathered in she was white with a couple of dots, which quickly filled in after her 18week moult.The isbars are blue, which still fall into the blue, black, splash rules. Both blue and black will hatch out dark with yellow belly/butt fluff. Splash breeders keep showing pics of light grey chicks (or light grey where the dark would be for the other 2). Blanche, PITA, and Quartz all were fluffy yellow fuzzies as chicks. Not a trace of any other color. All 3 feathered out white, then got the dark spots just like Aster. The Feathersite link I posted had a pic down at the bottom of a fluffy yellow chick with a caption about it being a splash bird. I'd speculate that most of the breeder pics showing light grey and yellow chicks actually feather out in a shade of blue instead. The pics are usually posted by largish breeders and I'm thinking they don’t/can't keep track of how each baby feathers out.