Rowlf was in Baker film number 9, but I don't think they showed that on Unpaved (the entire skit, not just Rowlf). Don't know if they didn't show the episode or just cut it out of the final...
I mean, if henson still owned the Muppets (all of them... not just talking about the Disney purchase, I mean the EMTV deal) including SS characters, they could use the skit again, but now that it's all split up and crazy.... I don't see how it's feesible.
But I have the sneaky suspicion that this was premeditated. They decided to use Baker #10 because, out of all the Baker films, I think it's the most popular. But I feel for you. Would have loved to see #9.