Intro and Inquiry (Romo de Vivar)

Good evening, all. My name is Sebastian and I have been digging through records to expand my knowledge about my ancestors. I split my browsing between my Mexican side, mostly Zacatecas and Aguascalientes so far, and my Guatemalan side. I have now been working on my tree for a bit and have picked up a few resources that have aided me. I have come to a set of distant grandparents, Jose/Joseph Miguel Romo de Vivar and his wife, Ysabel Rosaura Lopez de Navas, of which I have not seen a solid link connecting Jose Migl to his parents. These are mentioned in the marriage between Ricardo Romo de Vivar and Geronima Anastacia de Velasco, document which I have linked below. I have seen many people place a completely different set of parents for the couple that gets married, with no supporting documents. I'd like to ask if anyone could shed light on this (hopefully saving me a ton of time) or know who the parents of Jose Migl are, before I attempt to look through films. Link to document(second entry):

https://www.familysearch.org/ark:/61903/3:1:S3HT-DY3Q-X25?i=108&cc=1502404

Hope all has been well. Gracias, familia.