bee can win and let me explain why. unlike other bijuus he has a vast array of abilities even in base. his taijutsu is on a higher level than the sharingan of taka sasuke, nearly killing him. his raiton abilities extend from his swords to even pencils. easily able to slice through wood element.
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what good is his regeneration if hashirama's arms have been sliced off?
bee is able to manipulate the tentacles of the hachibi even in base form, which enables him to instantly have a long reach and even put a stop to minato's attack on his brother, earning minato's praise.
using lariat in version 2 hachibi, he can blow away his opponents chest, even that of sasuke and kisame
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. its fast and powerful close combat
despite mokuton's scale, and ability to capture other bijuus, kurama and the others lack the long range powerful techniques of the hachibi such as whirlwind and ink clone sealing. bee almost took out 6 jins at once with one sealing tech.
remember bees never went all out vs kisame due to not wanting raikage to find him and to protect his friends.
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. also since one single blow can destroy a forest. hashirama having the lesser bijuus under his control does not mean he can take hachibis powerful long range techs. plus theres no one like bee. hes the most experienced perfect jin, even earning kisames respect
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and being a perfect jin makes genjutsu useless. so darkness genjutsus a no go.
he can blind his opponent with ink, even underwater
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A claimed Bee is stronger than him
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, as proven when his own lariats overpowered by bee's.
the destructive power of bee's bijuudama was enough to fill an entire valley and break a very strong barrier
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The ball can be fired differently, either in sphere form, which gives it a wide area of damage, or as a concentrated beam of energy which gives it explosive penetrative power.
bee on his own is incredibly durable. suigetsu, sasuke and juugo combined could barely do a thing to him, and even sasukes chidori direct hit didnt work. he took a direct kick to the neck from sasuke and shrugged it off. and bee was so incredibly fast that he intercepted A seconds before A could attack a naruto who was trying to form seals
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bee can also throw his sword to keep his opponent on their toes as when he tried to stop itachi using MS.
While in full Eight-Tails form Bee can spin to summon up a great force of wind that can destroy an entire forest with ease
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bees also gained samehada which while limited somewhat in how much it can absorb at a time, and has the weakness of fire element, will still munch on the chakra in hashirama's trees given that he does use chakra to manipulate them. Samehada and B are capable of working in tandem; while it attacks the enemy on its own, B attacks them from a blind spot
even in full mode, hachibis reach is so extreme it seems to cover huge distances and is so big that its strength is enough to send the 5 tails flying with one slap
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and finally hachibi can seal opponents away with octopus hold and ink clones.
hed have to catch him first and as i just proved bee is much faster and more destructive than most bijuu due to being second strongest and having its long reach.