This phrase makes what you are saying on this topic your opinion. If you talk to people that breed Sugars/Calicos you will know that what you are saying doesn't hold up to real world results. Your idea does apply to many genes and characteristics. The black back, low/no dots, blushing, pattern tearing, color, and everything else are genetically reproducible. This helps differentiate high and low quality animals. People that breed these genes will tell you that the gene randomly presents in various quantities of white pigmentation. There is no correlation between low white animals producing low white animals and vice versa for high white animals. The amount of white happens to randomly present on Sugars/Calicos. I do no intend to offend but your hypothetical opinion just doesn't stand against real world experience of people breeding Sugars/Calicos.
Regards,
B