I have been trying to find info on the second guitar player on “You Don’t Love Me” as well. I called Bill Ector of Hittin’ the Note. He said he was at that concert, but didn’t remember anyone else getting on stage with the 5 surviving members. He mentioned Les Dudek as a possibility. I submitted an inquiry to Les’ web site. His rep responded, regarding Les’ age, but hasn’t responded about whether it was Les playing with them on the one song at that concert.