B. Monte read what I wrote about how Jonathan Winters didn't appear that often with Johnny Carson even though those appearances always went well…
I can think of one reason that might explain why Johnny didn't have Jonathan on more often.
You have written about how Johnny tightly controlled the show and that almost every impromptu story and surprise stunt was pre-approved. While the Winters segments were very entertaining, I can imagine that Carson had a love/hate relationship with having Winters on the show — they were great segments, but Johnny had no control over what would happen (and had no chance of regaining control).
I dunno. Johnny had Rodney Dangerfield on as often as he could get him and Rodney was pretty much on auto-pilot. If you watched Rodney on talk shows, he came out with a list in his head of the jokes he wanted to tell and the order he was going to tell them. A host could knock him off his script by trying to get him to not go straight on to the next one. All Johnny would do was to interject a quick question like, "Have you seen your doctor lately?" and Rodney would say, since the doctor jokes came later, "I'm going to the doctor later" and plunge right into the next joke on the list.
Other hosts tried to actually participate in Rodney's "act" and to actually interview him. It killed his rhythm. And Johnny did the same thing in that clip with Jonathan: just laid back and let the guest soar. He also did it when Robin Williams was on and he let guests like Charles Grodin control the conversation if the audience was laughing.
One of the things Carson learned from Jack Benny — one of the things that kept Johnny on the air for so long — was the principle that if the audience is laughing and it's your show, it doesn't matter who's getting the laughs. Benny let Don Wilson get the laughs. He let Dennis Day get the laughs. He let Mary Livingstone, Mel Blanc, Frank Nelson and all the others — and especially Rochester — get the laughs. Johnny loved it when a Don Rickles or a Mel Brooks got on a roll.
And you can see how delighted he was with Jonathan in that clip. I'm wondering if Jonathan didn't resent what The Tonight Show paid and turned down requests to come on the program…and only accepted them every so often when he felt the need to remind the industry that he was still around and still funny.
Then again, the guy loved to perform. I once saw him do 20 minutes for customers in a Honeybaked Ham shop on Riverside Drive. So like I said…I dunno.