Maybe Sakura is there to heal Shika after the fight and witness with Sai Shika's victory and revenge. Despite this, I still feel Hidan is coming back somewhy. He seemed too sure of it. It would have been better if Shika took Hidan's head and kept it safe in the village after finding a good way to shut Hidan's mouth up. Also maybe the Akatsuki will reveal some info about Hidan's power as they talk about his death.
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