Nice arguments from the both of you. From those scans you posted, it becomes apparent that Yamato can patch cuts by using his wood to cover any skin that is bleeding. I don't think he can heal though and I haven't heard him saying he can nor does it state this anywhere in the data book or the Naruto Wiki but it is logical that he can patch any minor wounds using wood style.
Still Darui's raiton didn't paralyse Sasuke because Sasuke is also lightning natured. It explains in the same scan that you posted because Darui realizes that Sasuke is indeed lightning natured since Darui's raiton did not electrocute nor even paralyse Sasuke. On the other hand, Sasuke shoved a raiton infused blade inside Yamato's non vitals and he instantly became paralysed so the same attack Darui performed on Sasuke should be able to at least paralyse Yamato if Yamato is already covered in water but Yamato does have the means to easily avoid the attack that Darui performed on Sasuke. Yamato could counter Darui's suiton with an even bigger suiton. Yamato's waterfall far outclasses the suiton that Darui used against Sasuke.
Darui's laser circus and black lightning becomes a big problem since Yamato can't simply block them with an earth wall or wood. I guess he can utilize wood clones while the real Yamato hides using the
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. He could also use
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to tunnel through the ground and then use the stealth skills he gained as an Anbu Captain to get behind Darui from underground and kill him.
Looking at Yamato's ninjutsu arsenal, he seems to be superior to Darui but Darui's abilities do allow him counter most of Yamato's abilities. For example, if Yamato tries to impale Darui with the
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Darui could just slice threw one of the wooden pillar so that Darui doesn't get impaled. He could do the same thing against Yamato's
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.
To win, Yamato will have to make sure that Darui can't counter his attacks and he can probably do so using bunshin feints and stealth manoeuvres. Fighting Darui at CQC is not a good idea for obvious reasons and since you've given both full knowledge, Yamato will know to avoid a kenjutsu clash with Darui since it will be at a disadvantage to him.
Now as for Darui, he has the advantage in this battle for due to his
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and
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being hard to avoid. The problem is that Darui's own attacks will obstruct his eye sight while Yamato could use tracking seeds to know where Darui is at all times if he manages to put a tracking seed on him during a skirmish.
If any wood come close to Darui trying to impale him or trying to immobilize him, Darui can
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through the wood just by touching it and neutralize it.
This fight has to many variables and the location advantage may not be of much use to Yamato since I don't think he can manipulate already existing trees with his own chakra. Correct me if I am wrong.