In Chapter 7.8 "A Silent Presence", I believe there was a ghostly vision cameo by Candaith. I also saw Talagan Silvertongue. While Candaith wasn't confirmed in quest text like Talagan was, I'm fairly certain it was him in his pre-Grey Company garb.
You know what's funny, I stumbled on this thread on accident, and this specific post actually made me play Gundabad when I had no intention of doing so. I had stopped on my highest level character at the Wells of Langflood cuz I was bored of dwarf stuff, and seeing this sparked a fire in me. I spent WEEKS completing the WoL, then the MoA, followed the dwarves into the elderslade and into Gundabad JUST to get a glimpse of a ranger, even if it was a vision. That is the power Rangers have over me xD.