Thanks for your comments. While the certificate is the most obvious piece of evidence, I think I brought up several other items that weren't hearsay. Below are some of the things that caused me to reach my conclusion. Some are small items, some not.
The name of the school and system Sin studied under was the Chung Yen Shaolin Martial Arts School.
-- He has never called his school this name.
-- The certificates issued to his students through most of the 1980s (unsure of exact date) do not contain the characters "Shaolin", "Chung Yen" or "Hiang Kwang The"
To date there has been no certificate produced naming him the Grandmaster.
His published training dates do not correspond with his certificate.
The material on the certificate doesn't correspond with the published info.
Just one question.....where's Hiang's Certificate naming him Grand Master
His legal effort in the early 1990s to copyright the system as the Grandmaster was dismissed.
Master Hiang kept a separate school for most of the time he has been in the U.S.
-- Neither one ever taught the other's class.
-- He was promoted in 1978 by one of his and Sin's still living former teachers.
-- He publicly refused Sin's promotion in 1983.
I think these items are fairly established and I've kept them to simple statements. No one item is proof positive, but together they indicate a troubling pattern arguing against the current claims.
Rather than replying point by point to the above, could you offer your evidence arguing for Sin's claim? Not a challenge.....just a request so we can move the dialogue further along.