I don't recall any specific mentions of Randy either, NMB. If there was, it was probably in the context of him being an original member.

And re: Glenn creating guitar parts he couldn't play, I would question that as well. Of course, it's not impossible, but, I find it more likely that he created parts that he thought were well-suited for other band members to play live e.g. I Can't Tell You Why. As WF said, Glenn was an underrated guitarist, but his RA limited him in his later years.