1- If it weren't aimed at Hashirama, where was it aimed?
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2- The giant Rasengan only slightly damaged it. As for the Arrows+TBB you're wrong. The thing that scattered there was Sasuke's arrow. Notice they have the same color:
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3- The thousand punches of Shinju senju never actually reached Perfect Susanoo since most of them were destroyed by the continuous Bijuudamas. Only the remaining punches actually hit Madara's Perfect Susanoo