Nice thread,but first look at this
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thses show that ninjutsu can hurt a juubi jin. Moving on.
1)madara already saw him coming and commented before he was hit. Madara equally reacted to his teleportation attack and escaped so quickly that sasuke nor naruto noticed,by the time the did he had gotten over 70m away.
2)sasuke naturally has good durabiity. If you take a look at the beating 1tk naruto gave him,you'd know. Also kakashi took an st that busted an earth wall. He dosent have sage mode.
3) cs1 sasuke also uses senjutsu,yet his chidori wasnt black
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it was cs1 that enabled his v3 susanoo to face juubito.
Also this is cs2 sasuke's chidori too,
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So senjutsu isnt the reason
3) sasuke's attacks when using hagoromo's chakra are much stronger than using his own,so ofcourse he could cut madara like that. Also obito and zetsu pierced madara with their fist. Cutting and blunt force damage are different.
4) madara survived guy's attacks because he could regenerate,not because he was durable,same reason he survived sasuke's own.