Lol Zexion, Hidan clearly wins this mid difficulty.
Breaking genjutsu should be easy for Hidan since he doesn't suffer from stabbing himself because his immortality and resistance to pain means it would be a gut instinct for him to do so. Not only that, but Hidan's battle performance won't get impeded if he hurts himself which is an advantage he has against genjutsu users.
Asuma and Kurenai have no knowledge so I foresee Asuma getting owned just as easily as last time. Also, Hidan may choose to attack Kurenai instead and it would be Asuma's gut instinct to protect her.
Bare in mind that Kurenai is not as intelligent as Shikamaru so she won't be that useful in discovering his powers.