Hey Indyhorse, we were reading each other's minds, lol!
It sounds like he might not be a gray if he was born brindle. That is GOOD news for your brindle.....he will hopefully stay that way!
So have the breeders produced other brindles? I had no idea there was a brindle "line" in Arabians. How cool! If it is genetic, then he probably isn't a chimeric, because chimeric is kind of a fluke of nature, from what I understand.
I don't care if the Arabian horse association likes it or not, I love exotic, beautiful colors.