Hello Alvaro, great work. Something I do recomend is that somewhere in your tree you write your proof statement, basically what you posted here, that way your family and other researchers know why his father is a de Leon and not a Flores. We find that Donaciano was born in Cerralvo and ended up in Reynosa were his children were born. He did have a grandmother that was a Flores. Maybe he did something in Cerralvo, fled to Reynosa and adopted his grandmothers surname as a way of hiding. Of course, I am just speculating.