I've had many people tell me many different things and I would like to know what y'all think? Now that I think about it, I've only really seen one other horse that looked like him and it was still of a little bit. But I'm about to sell him and I would really like to know
He is a sorrel/chestnut (whichever you prefer) with sabino roaning. It's a common color in TWHs and I believe they refer to it as "lit up roan".
In other words, he's not a true red roan. He just has lots of roaning from the sabino gene. The sabino also accounts for his white markings.