Very odd question...seeing the Tom Poston clip of the Winner's Circle round is what put this possibility in my head.
I figured that's what did it.
Letter of the law would be both players come back. Realistically, there would be almost no chance of this happening. Adam Nedeff noted in his book
Game Shows FAQ celebrity partners were tested carefully to make sure they could play the game well before they made it to the air. It would be unlikely
both celebs would do that poorly in the Winner's Circle--although usually, they made sure the celebs had roughly equal skill level (Tom Poston was on with Anne Bloom, who had done the show a couple of times before, although she wasn't considered a stellar player).
I note from the Bob Stewart Wiki guide Poston never came back, but he appeared on
Super Password 14 times during this period. Curious.