Gray Inhibitor Update
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Unfortunately I have not found a good family to study like I was hoping. I have however been contacted by the owner of a Arabian Mare who may be gray inhibited. http://www.allbreedpedigree.com/estebna4
She has 4 gray foals 3 that are normal gray and one that has tested as gray but has not grayed as expected. The filly is still to young to say for sure however.
She was 13 in the first picture. I'm not sure of age in the other two but included to show similarities. Her owner states that she has still not grayed out at the age of 17 and that her color is always "brighter" in summer than in winter.
She is a bit more gray than I would like to see but the similarities are striking.