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You are overrating them, ignoring their limits and ignoring Hashirama's strengths to fuel your argument. Just from reading the Manga you'd know that nothing you stated is even remotely possible in this fight.
1. Orochimaru can't use Reaper Death Seal. He only has the scroll for the release of the jutsu.
Im not ignoring their limits, and im fully aware of all of hashirama's abilities and what he is capable of. Im not Hashirama hating in any way, and I havent even began to start a argument for how they counter his techniques, I only gave my opinion of who would win.
I mentioned orochimaru using Death Reaper Seal for multiple reasons.
1. He already stated that he began
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. So its seems obvious that he not only became aware of the technique,
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or activate it[
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] (Learned how to Summon and Control the Shinigami). We know that he could just use the hand signs from the beginning because he didnt have the ability to use jutsu at the time which is why he needed the mask.
2. Orochimaru as far as we know is still in possession of the Shinigami Mask.
3. When I checked wiki as a source for Orochimaru's techniques it had Death Reaper Seal as a technique in his arsenal. And the Shinigami Mask as one of his tools.
So I would say that orochimaru is able to summon the Death Reaper now and remove the souls of his opponents, and even if he cant use the actual hand seals he has the mask in his posession to summon it.
2. Mokujin at it's largest is PS sized. Bijuu are the size of PS's head. Jiraiya sinking it completely is nonsense. Manda being large enough to wrap around something PS's size when it's only Bijuu sized is nonsense. Manda being able to bind something as physically powerful as PS is nonsense. Bijuu>>>Manda in physical power. PS=Mokujin>>>Bijuu in physical power. Mokujin at it's weakest is Full Kurama sized, still far larger than anything Jiraiya has ever sunk. It has physical power equal to Full Kurama according to DB, which is >>Half Kurama>Other Bijuu>>>Manda in that category.
I dont understand where you aquired your scaling of these techniques.
Here we can see that Mokujin is shorter than Perfect Susanoo. [
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Here we can see that Mokujin and Kurama are equal height. [
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] and [
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Kurama is only slightly larger than Gamabuta if you exclude the Tails [
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And Manda is shown to be larger than both Gamabunta and Katsuyu. [
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But you do make a point about its strength equal to that of PS, so it seems Manda wouldnt be sucessful in trying to restrict it. But saying that Jaraiya enhance with senjutsu couldnt create a Swamp Larger than Drugged Base Jiraiya is a far cry from the truth. Mokujin is definitely getting draged down, or if nothing else STALLED.
The Second DataBook states:
"The adhesive, chakra-infused mud ensnares the enemy's body, making it almost impossible to recover one's strength and escape from the swamp. The size and depth of the created swamp depends on the user's skill and the amount of chakra used, but if the user is an expert in this technique, it will always be possible to make a fair-sized swamp which is extremely effective against a great number of enemies or when having to face gigantic creatures."
- Second Databook, page 261
So with a enhancement of senjutsu and his mastery of the technique Sage Jiraiya should be more than capable of creating a swamp deeper and stronger than what was used originally.
3. Doesn't need one when he'd crush these 3 within minutes of the beginning of the fight. Gama Rinsho is never happening here. He has nowhere to hide and he can't fend Hashirama off while the toads prep it.
Hashirama calls Mokujin and it obliterates them.
Hashirama has no knowledge of Gama Rinsho, so he wouldnt have the slightest clue what ma and pa were doing. With Gamabunta, manda, katsuyu, orochimaru (summon Rashomon) and Tsunade on the field Hashirama will have more then enough to deal with (especially if Mokujin is trapped in a swamp). Jiraiaya will have more then enough time to prepare and once its heard Hashirama is K.O'd.