This Red Sox player is the final player (EL154) needing to be ID'd in Folder EL. Now, he follows Bill Monboquette in the numbering, but Mombo is a righty and this guy definitely signing (or pretending to sign) with his lefty hand. He looks enough like him, and I can find no alphabetical minor leaguer that would fall here between Mombo and EL155, Bobby Morgan.
Again, I marvel at everyone's devotion to research to this end. Thanks.