But he was in the Paul Williams, Charles Aznavour, Lena Horne, Peter Ustinov, and Sandy Duncan episodes, so I don't know what your logic is supposed to be suggesting.
It's worth noting that in a lot of Season One episodes, the same characters appeared in the goodnights quite a bit- Piggy, Fozzie, Gonzo and Hilda especially, also Wayne or Wanda, Scooter and George. Sometimes they weren't even in the episode proper (like Gonzo and Scooter in the Kaye Ballard goodnights) but were still in the goodnights. I'm not trying to stretch it as far as that, mind you, just kinda doing what they would've done, save for where I take liberties as far as character creation dates for the purpose of subject and sketch matter.
David "Gorgon Heap" Ebersole