1. Replay the entire Hashi vs madz fight until the very end. Madara killed the Mokuton clone. Hashi appeared behind madz and stabbed him, at that VERY MOMENT, MADARA COULD'VE USED IZANAGI to appear BEHIND Hashi and stab him with the weapons Madara had in his hand.
2. People say that Hashi would've still solo'd, but he was in no condition to continue fighting. Let alone counter Madara's surprise attack.
3. People are talking about SM Hashi being ableto sense it, how if Hashi wasn't in SM?
Madara lost on purpose because it was the best opportunity to fake death.And gain auras chakra.