Hashirama still shits on Hiruzen.
Lets not underestimate Hiruzen
mobility here. Your claiming that Mokuton on top of Mokuton will be able to overwhelm him, when this guy was able to leave the village to where kushina and minato were in a very short time[
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] to [
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]. Jumping on top of Juubi head deity (reaching Sage Art construction) gate at the same time as Hashirama and Tobirama[
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]. And also getting out of Gojo explosion range, which is even bigger then Deity Gates. I see no problem here, as Mokuton will just become a new platform to fight. Worst case scenario, Mokuton attempting to crush him will be blocked by a diamond cage. Or forming Doton mud wall underneath him, elevating him more upwards.
Hiruzen versatility with his elements gives Hashirama's Mokuton a new challenge, as none of these component are able too to catch or suppress its ability, which is what Mokuton is base on ninjutsu wise. A combination of Fire+Wind pressure was stated adds the katon will extra explosive priority (somewhere kakuzu databook)[
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]. Hiurzen (with a clone) dealing more damage to Mokuton[
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]. You might think that just layering Mokuton over another would protect him but lets not forget was a katon that creates an entity of a dragon, to which he can manipulate and control[
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]. Adding wind to it will give the dragon entity to blow right through any construction, while also being guided. Just imagine a homing missile, maneuvering most Mokuton while keeping focus on the main target, less Mokuton are will be able to block that. A direct hit would KO Hashirama or put him in a state that he needs to recover badly. Not only that but if Hiruzen summons a Fuma Shiruken, throwing these things will end up being unpredictable as Hiruzen and choose when or not to clone them. Lets keep in mind that big heavy shirukens were able to plow through Buijuu flesh and still continue its momentum[
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]. One can argue that Obito's was bigger but only by 2 inches, which wouldn't make much difference. Even if still think Mokuton should be able to tank the fuma shiruken, lets not forget Hiruzen element mastery. Using nature manipulation such as Raiton, to channel against the shiurken would further increase its penetrating attack power. Mokuton will not be able to catch this and the fact that Hiruzen has the ability to clone them, having Hashirama attempting to counter countless giant blades infused with Raiton.
Close quarters, Hiruzen is very sneaky, If Hashirama attempts to try overpowering him in physical combat, will end up
1.)
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,
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2.) Enma can come out and follow up with an addition attack or trap you in a cage.
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Lets remember whos Shadow clones end up having the most durability in the series
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Any other shadow clones would go proof from a direct hit. Hiruzen clones will need to go down as if they were the orignal themselves. A clone battle, Hiruzen can win with quality. And the fact they each can infused Raiton, Katon, or Futon in their ninjutsu weapons. Each using shiruken clones? Hashirama gets showered with Elemental Shiurkens, going though anything he has to offer to protect him.