there is really no known cause for the calico look in horses right now.
I did just jump in with the information that I know about him. There was quite a bit shared about this colt elsewhere.
I still stand behind the fact he should be gelded and it should be before
he goes to someone else. I can foresee someone snapping him up to breed to him because of his color alone. Not saying it will happen, but I can see it happening. To many people breed for color and color alone...