I have to disagree here.

Are you trying to say that progesterone has no role in certain presentations of gyno?

Progesterone is responsible for the differentiation of the alveoli and lobules in estrogen sensitized breast tissue.

Without progesterone, prolactin has minimal effect on breast tissue. Progesterone must "prime the pump"

The most convincing evidence for the role of progesterone in fina/deca related gyno is that RU-486 is the most effective treatment.