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Do you even manga bro?
Do you? Hagoromo says it right there "In other words he mixed Indras's chakra with Ashura's chakra ... And that brought out my chakra. That's how he awakened the Rinnegan." Hashirama cells only boost stamina and increase jutsu power (such as KA recharge time) for the majority of people, Madara also got healing ability from it. It contains Ashura's chakra but that's not a power Hashirama can use in fights or anything.
Being an Edo Tensei weakens Madara so the stamina boost and powerup jutsus didn't play a part in his fight with the Kages. Being an Edo he didn't need to use Hashirama's healing. Do you read the manga? What I'm saying is right in that scan, you're helping me out, as I said the boost Hashirama cells give and Madara wasn't using them as an Edo, he did use Ashura's chakra which is a power that's not Hashirana nor could he use. Rinnegan lets you use any jutsu
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You're arguing that because he got Ashura's chakra from Hashirama's DNA that he's using Hashirama power, that's not Hashirama's power as it only makes him a reincarnation, he never shown using any sort of special ability that goes with Ashura. So as I said before, Madara wasn't using Hashirama's power, he outright said when he was using Hashirama's power after being revived when he said Hashirama's healing and senjutsu. So my point still stands.