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That’s exactly what he’s saying. Assuming his numbers are correct, then his Marcy variant works well even in adult males (Koreans, at least). There are others who claim that Marcy works well. There was a study in Japan that showed this. Dr. Brown claimed to have success with it, although he was all over the place in terms of techniques he was using, and his criteria were never clear.
One problem with studying this is that there is no “standard” way to do the internal ring stitching part of Marcy. Dr. Kang claims to have a particularly effective way of doing this that he refined over the years. I don’t know if that’s the key to his success, or it’s just a minor aspect that improves it a bit.
The bigger problem is that tissue repair is out of favor, and almost no one practices it. We are not likely to get better information about this topic, unfortunately.