Alot of people are greatly underestimating hidan, not just that he is a bad match up for those two. Neji and lee are taijutsu fighters therefore they prefer close combat and so does hidan because of his ability, if he does draw blood during his fight with either one and i believe he would, they are dead.
Deidora is also a bad match up. He is a long range fighter and both lee and neji arent. He would just bomb raid them. Not to forget the best way to neutralise deidora's bombs is by using lightning based attacks and neither neji or lee can, not to forget although neji would be able to see the colour of chakra, he doesnt have a way of defending himself. There is even little hope for lee.
I really cannot see them defeating anybody maybe zetsu (who isnt a combat fighter) and konan