Jose Aguayo, Welcome to the Group. Sorry, I don't have any information on the Aguayo surname. But your post reminded me of the myth of the three brothers. I read this article once that spoke in detail of the myth. I did a quick internet search and this was the best article I found:
http://blog.eogn.com/eastmans_online_genealogy/2006/02/there_were_thre…
Sounds like you have documented sources so I imagine in your case there was actually three brothers... But when I first started researching my genealogy, my father told me the story of the three brothers. I have researched his family six generations and the three brothers do not exist, well at least not yet ;-) . It's curious how everyone has a three brothers story. The original article I read (several years ago) attributed the story to Noah and his three sons who all went off in different directions. You then see it in medieval tales of a King and his three sons. The story gets repeated in fairy tales, etc. I guess three was the magic number.
Good luck on your Search,
Angie Godina