Personally, I can't tell if it is him or not in the auction picture. Here is a link to an early image of McGraw from nearly the same vantage point in case there is enough contrast for somebody to do an ear study. Have you reached out to Al to ask how he is sure? I'm pretty sure that he'd share with you his rationale for his conclusion.
https://h2j7w4j4.stackpathcdn.com/wp-content/uploads/2020/08/McGraw-John-young-HA.jpg