No way to know for sure, ask orthos around town. Try and gather some numbers. Maybe see if you can contact his mentor and ask for references in the US. If he doesn't volunteer your surgeon, then that means he doesn't think highly of him. Realize that 7mo isn't all that long, doing 3 surgeries a week with partial supervision, how much do you think they can really learn from the mentor? It's more of a way for the mentor to get papers published. Young is a big red flag for me, needs at least a few hundred surgeries and a few years to even be considered along with good recommendations from orthos that have worked with him. Personality is big, if he doesn't come across well don't take the chance and move on to someone you like. Not worth it.