I think the Hashirama face on Danzo and Madara is probably not Hashirama's original face he had when alive but a cloned face, Tobi does have a clone of Hashirama which Yamato is stuck near.
Danzo seems to have his original arm in this Kabuto flashback but it has some bandages covering it so it may be damaged a bit which could be why Danzo traded it for Shusui's arm.
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