Actually the count is greater. Don Helms was a Troubador as was Bobby Garrett. Jerry Byrd, Jimmy Day, and Speedy West among others did sessions with him. If you check out the session logs in ET's biography it is amazing as to how many HOF players worked with ET.
Bobby Garrett came after Buddy E's first time ,then Buddy E , then Buddy C, then Don Helms , then Lynn and sometimes Johnny Cox. All these guys have buckles. Jimmy Day I think had one too .
Joe I am not sure if all the players buckles are in there. I have seen the case too but don't remember. I got the order of the players from ET's biography. If you can find the book it is a great read.
Actually I think you know this too,Spend some time with Lynn and he has the best stories of all. Funny too especially the time he won ET's Bus of of him in a card Game.