Great ! this is a very familiar story for me, I , and many people from my hometown in the state of Sonora Mexico, know the story about El Moro De Cumpas, and the families involved.
In fact I named my first car (Yes, My Car) a 1956 Chevy, 'El Moro de Cumpas' because it had that gray look of a moro horse. lol
Nice.