ROFL! No, no crazy secret. Sheesh.
It comes down to this- without knowing exactly what the genetic background of your white is, there isn't a good way to predict the outcome. If I had an accurate crystal ball, I'd be sure to share. Robin wasn't trying to hide anything, she was telling you about her experience with her white.
I have both dominant and recessive white. My white chicks, depending on parents, hatch out silver (look splash, are silver gene white), pale gold, or white. All feather in white. If your white is masking something else, like partridge, who knows what you'll get. The genotype (what is actually there genetically) is not always the same as the phenotype (what you see) therefore you can't predict what a black LOOKING chicken crossed with a white LOOKING chicken will produce without knowing the genotype.
Hope this helps.