He is a tobiano, not a solid or he would be a base color (black, bay, chestnut). He has paint tips on his ears & blues in the eyes. Leading to believe he is suppose to be a medicine hat.
Legends with our Indian Nations as the Medicine Mans horse.
Warrior fits his name very well being he is a Mustang.
Its all DNA and tobiano is a fun pattern ranging from splashy to barley. All patterns of white are created by genes that block the horse's normal color. Pinto genes block the base color from expressing itself, leaving the hair white.
Tobiano patterns can hide in the DNA or layer over another paint pattern.
From patches, paw prints, spots and of course medicine hats, near whites and more, its all in the breeding.. One foal being full splash to its full sibling just having a chest & flank spot with blue eyes to a solid next round.
It could also determine the parents being homozygous or heterozygous for the tobiano gen, from another paint pattern or a solid.