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As an interviewer, I have asked candidates what questions they like to ask when interviewing and then proceeded to ask them that question. :)

Or ask the candidate "when question should I ask you that I haven't?" These are somewhat softball questions, but they let the candidate drive the interview and highlight what they think is important about their experience.

I'm willing to believe that the ideal candidate is a fixed point under your operator, but I think it's going to be tricky to prove convergence :)

And there might be other fixed points, perhaps with even greater catchment areas.

Now, would the old candidate be pushed down the stack, or would there be some TCO (tailing candidate optimization) going on where only the most recent one exists?