I wonder how likely it would have been for Jim Henson to perform a one-shot character with no dialogue by season 16. He did continue to perform one shot characters in the late 1980s, I guess it is hard to know whether he actually did do a character with no dialogue without behind the scenes photos or call sheets or whatever (I know he did do a non-speaking role in the song “Please Say Toothpaste Somebody”, but he was originally going to perform the lead and just happened to be too tired to sing).
I assumed that Jim continued performing Chrissy in the late-1980s, but it seems Richard Hunt and Kevin Clash were often performing him in those years. Makes sense since Jim was often busy.
Bob Payne is a performer who was often uncredited (though he did get his performer credit in the special end credits sequence for the Puerto Rico episodes), in seasons 10 and 11 he seemed to be most active as a performer on the show, often with speaking roles. And it seems like the scripts usually credit him when he plays a role on the street. I’ve heard that the scripts often don’t credit Muppet performers, but there were instances of him being confirmed as certain characters before video footage was available (it also seems that way for some of Brian Meehl’s early performances). Makes me wonder if he was credited in all those scripts.
Back in 2009, I e-mailed Brian Meehl, one of my questions was which season he started on, he said the 1979 half of the 1978-1979 season. I know performers often misremember things, but I saw on the wiki that he performed Sam the Robin in the episode that premiered in January 1 1979, so he would have been performing on set in 1978.
I hope soon we can figure out the earliest known instances of Brian Meehl and Michael Earl performing on the show (I wonder what the earliest confirmed ones on the wiki are.... I probably could determine that myself). I wouldn’t expect to find out their true first performance (probably something where they don’t do voices).
I also hope soon the wiki can uncover the first time Michael Earl voiced Snuffy. I always assumed he first performed Snuffy in season 10 and that his first vocal performance as the character was in season 11, but he could have started doing the voice before season 10 ended or after Snuffy made a few appearances in season 11.