Prof Yellen is a professor. People like that, have integrity, you have to in order to teach young people.
What Janet Yellen is not, she is not a politician, or a lawyer, unlike the rest of them, Gina, Tony and Jake the snake.
I think the PRC leadership understands that.
Yellen could say anything, and politburo will not really believe her, if they do not want to.
The Chinese have no illusions about the Americans, but with Yellen, the Chinese have no illusions about this person either, she is trying to be someone she is not.
All those odd ball things she has to say, remember this is a professor who will fail you if say crap like that. I never heard anyone say important stuff without any conviction at all.
Yellen can deliver the message, but everyone knows she does not believe in what she is saying, unlike those other three.