1. Countering the argument regarding poison.
Sadly, the main argument your opening was based on, is actually useless. You tried to prove that Sasori's poison would work on Orochimaru, but actually it's not true.
You were right about Zetsu having inhuman features. Also, you were right about Zetsu being vulnerable to Genjutsu. The problem here is that Zetsu themselves stated that they
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- something that is needed for one to get caught in a Genjutsu. I'm not going to get into details, since we don't know how Zetsu body works in the first place (anyway, it's obvious that they must have some decisive organ or something like that, BUT we DO know, that Zetsu don't possess organs, veins or a bloodstream
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,
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,
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.
Now take a look at
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. Look closely - Sasori clearly speaks about how poison is making its rounds in Kankuro's bloodstream. Orochimaru doesn't have it - poison cannot spread thoughout his body.
If it wasn't enough, Orochimaru was also well-known for modifications done to his bodies, including
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. Note that Shizune wasn't someone who Orochimaru was spying on to know her poisons, yet he was said to have immunity to them. Now considering that Orochimaru and Sasori were Akatsuki partners, he would be more familliar with his abilities than with abilities of Tsunade's apprentice.
Moreover, you yourself admitted, that Orochimaru doesn't breathe - making gas poison even more useless here. But what about poisoned senbon? Look at this scans -
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,
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. Orochimaru's fake skin layer was strong enough to prevent Kyuubi Naruto's claw strike from harming even a little his main body. I doubt the senbon are getting even past this layer of defense.
2. Countering the 'no blood' argument.
It is true that now, due to possessing a Zetsu body, Orochimaru's human shell does not possess blood. But it seems that you aren't aware of Orochimaru's other ways of getting blood required for summonning techniques. I think you won't disagree with the fact, that Oro's True Form and 8branches still possess blood, due to not having any connection with a human shell
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,
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.
During
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,
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or
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, Orochimaru was using the snakes, that are in fact his true body - a body that possesses his blood. Thereby, nothing stops Orochimaru from releasing a single snake to get the blood needed to summon any of his Giant Snakes.
Anyway, summonnings wouldn't be needed as long as Sasori stays in his Hiruko, so I probably use them as an argument later in the debate, when you get more serious ;>
3. Making Sasori move out of his Hiruko puppet.
Facing Hiruko wouldn't be lethal - in fact, Sasori should be smart enough not to fight Orochimaru in that form, since it would only be a disadvantage for him. Hiruko's fighting style is a stationary one and with Sasori being hidden (but it also means somehow trapped) inside of it would only leave Sasori's core vulnerable to getting pierced by
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(but probably used on a lesser scale, due to the location),
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or by using a sneak attack that would consist of
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a random snake, scattered somewhere around the battlefield into a Kusanagi and using
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to backstab Sasori.
As for Hiruko's offense, it has nothing that could even cause any harm to Orochimaru, considering that the senbon aren't meant to kill with piercing damage but with poison, which is useless here. Actually, if it was a normal human and if all the senbon hit precisely, it might've dealt some serious damage, but considering that Orochimaru was shown to laught at getting his hand cut off, getting stabbed by Totsuka and many more, some shallow wounds aren't a threat, especially that the are getting repeled with
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, something that managed to root out trees.
Also, you mentioned the Hiruko's tail. While I agree that it is very versatile, not only would it not even catch Orochimaru to begin with (due to his great speed even in base, not to mention other enhancements, but I will get back to that issue in another post, since against Hiruko it isn't even needed). But even if it did catch Oro,
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would happen. Soft Physique makes squeezing and gripping useless, not to mention that Sasori bringing Orochimaru close to his real body would be the stupidest thing he could ever do.
To sum up this post, the longer Sasori stays in Hiruko, the worse it gets for him. You definitely need to move forward now.