I suppose if you wanted to get technical, a "reverse leopard" would actually be colored something like this mare...solid with white spots as opposed to a traditional leopard that is mostly white with colored spots.
OP, if your horse is, in fact, an Appy, then I would bet that he is a fewspot or perhaps his base coat color is gray and his non-white markings have faded over the years (maybe both, since it looks like he has a dark skin patch on his neck in the riding picture). Not sure where you're getting the 4 colors....or the "reverse leopard" part of it though.
Either way, the pictures aren't good enough to tell much about his conformation.
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