He didn't. I saw them at the Fillmore Auditorium in 1996. Dickey wasn't on stage with them that night. IIRC, he was so drunk that Gregg Allman wouldn't let him play. I haven't read the book so if it's mentioned, the details might be different.
I didn't see them with Duane, but did many times after the 1989 comeback, both with Dickey and Derek Trucks after Dickey was fired.