Obito stated that Zetsu was very weak and not even a good combat type (the only good point about him is that he is resilient and the negative is that he is easy to beat), whereas at the end of his battle w/ Konan he admitted that he had underestimated her and that he would be dead w/o Izanagi. Also, Hidan was taken down by a 15 year old kid who could mainly only use shadow possession techs and some paper bombs. Shikamaru is a genius, but still. Hidan is an idiot, all Konan has to do is somehow blow him to pieces. If some fodder ninjas can slice off Hidan's head and not get hurt by him, I'm quite sure that Konan can dismember him w/ her bombs. Hidan will still live at the end of the battle, but he'll be quite useless.
Konan is stronger than both Hidan and Zetsu...any other members, not so much.