I don't care if Sasori has blood in his chest compartment. Since Hidan is "the slowest in Akatsuki", and Sasori is a deadly hand to hand combatant, Hidan isn't going to get the chance to stab him obviously. Let alone through the super tough armour of his outside shell that Sakura needed to break with super strength. Hidan is slower and worse at everything than Sasori. Sasori can just grab Hidan with chakra strings the moment the fight starts, including his crappy scythe, and have him dance like a puppet. I don't even like Sasori, and this is a stomp by him.
No way of blocking Hidan's hits? Are you F#$@ing high? The guy has a tonne of ways. Like the giant metal fist, or metal tail, his primary puppet armour has. Or via his chakra strings which can literally grab it (and Hidan) from mid air. Or via any of the numerous weapons or puppets that pop out virtually instantly when called.
Yeh, his giant metal tail which effortlessly blocks attacks (without looking) will be helpless against
a scythe!!!
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Notice also his huge metal fist for blocking, and the armour itself which only super strength broke (and which Chiyo said she would be unable to break herself). Then his actual body has numerous blades to block with:
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Ridiculous that Hidan is being advocated by anyone here.