Fantastic answer by the way. Geese are really underrated in most ignored. It is really hard to get information. I have to trust what I have learned so far from the breeders who have spent time with me. I did read the PDF you gave a link to about 2 years ago. Got no answers just more questions...
Thought i would add this if it helps. Color genetics is not a simple as one color to the other but playing with the duck color calculator I will put a link at the bottom will give you a idea.
Geese colors are a little less complicated but the duck one is easier to understand. There is a goose...
This is what I have learned so far, White is not sex linked it is its own color genetic. Brown is not sex linked it is its own color genetic.
By breeding the 2 colors together you get both boys and girls that carry both genetic colors. You also get babies that throw both traits. Brown on...
If there both pure color (not split in the recent past) you should end up with splits. If you get a white it will have a splash of brown if you get a brown it will have a splash of white. This can carry on for a few generations when you breed back to get the coloring pure again. There refereed...