While I don't know any specifics about Dr. Esquerra, I would like to present another perspective.
A couple years ago, Dr. Stewart, an excellent and highly regarded DS surgeon in TX, died suddenly and unexpectedly. His practice was taken over by Dr. Ayoola, whom most of us had never heard of. However, we learned that he had been working with Dr. Stewart for a good length of time, doing the DS's with him, and there were people we trusted who knew him who assured us of his abilities and personality. Since then, Dr. Ayoola has gone on to develop an excellent reputation in his own right and even does RNY to DS revisions, which are very challenging surgeries. We are fortunate to have him as a DS resource.
So what do we do now regarding Dr. Esquerra? There are two differences between these cases:
1. Dr. Ayoola is in the USA and Dr. Esquerra is in Mexico. It is harder to put our trust in the medical system of a foreign country. And for some people, specifically for Mexico. I understand that, but would point out also that some of the worst stories we've encountered over the years have happened right here in the USA. Given a choice between Dr. Esquerra and some surgeons in the USA I would be headed across the border in a heartbeat.
2. With Dr. Ayoola we had inside information, so to speak, from someone in the medical profession who was very much trusted. With Dr. Esquerra our information comes from an employee only. The numbers sound good, but it would be better if someone we really knew was there to reassure us.
It will be up to each individual to decide whether the experience that is being attributed to Dr. Esquerra is sufficient for them or not. I would not presume to make this decision for anyone. One last thought: there was a time when Dr. Ungson was the new DS guy. He trained with Dr. Balthasar in Spain. At some point enough people went to him in Mexico that we heard all about him and recognized him as the "go to" guy for the DS in Mexico. I hope Dr. Esquerra can fill that role, because we really do need good self-pay resources for so many people.