I'm thinking he was probably a sunbleached brown, or else bay. Or do you mean of the first set of horses? The two "whites" are fewspot browns.
Interestingly, and too bad you can't see it in the picture, but the first leopard had one palomino/yellow spot on her shoulder. Looked like a urine stain that wouldn't go away. Don't know what was up with that.
Oh. Well that there crap is the Lp at play, I'd say. It does funky things to the base color. I think some people call horses like that "peacock leopards" due to the multicolored spots. Genetically, I'd bet on him just being a plain Jane brown or bay for base color, but as for how the pattern is affecting it...you'd have to ask Faceman or an Appaloosa expert.
If you look, though, you can see that the leg spots are dark, as they should be on a brown, while the "points" are lighter and more fawn (in the flank/rump/nose/eye area, again like a regular brown). And all of the body spots appear to be the same shade, though some are more roan than others, making them appear lighter.
That doesn't negate the weird things Lp does, though. Someone on another message board has pictures of a genetic grulla Appaloosa mare that looks like a chestnut, her base color is so skewed by the App genes.