I argue that verbalizing to the duck without involving another person solves many problems just by itself. Deeper problems may require verbalizing it to a person. In my professional experience, I have lost vast amounts of time and attention to people who would break my flow state to explain the problem to me and figure it out themselves while verbalizing it for the very first time. So, I explained Rubber ducking to them and gave them all ducks. It worked wonderfully.