If he goes Gates in the beginning - we're skipping this point. But it doesn't change the fact he's vulnerable to random snakes biting and poisoning him - especially that they have minds on their own.
Not really. Having minds of their own doesn't mean he'll get caught by them, not to mention he can smack them away with his Soshuuga.
Show me the panel where Madara's Susano'o is shown destroyed by Hirudora. All you have are pure assumptions. Mei's Water Dragon could push Madara back as well, but did little to no damage. Hirudora couldn't even damage Kisame properly, meaning it can't do shit to Orochimaru, whos human shell doesn't care about physical wounds.
-Susanoo was hit.
-Mokuton binding was broken.
Unless you can give me a reason not to believe that Susanoo wasn't destroyed, there is nothing more to say here. Susanoo was destroyed, that simple. Did Mei's Suiton push Madara back, break his hold over Mokuton, and then left him out of action for a whole chapter? Oh yeah, didn't think so.
Hirudora was underwater, and went through GSB first, and Gai said he wasn't going to kill him, add that to the fact it destroyed Susanoo, and I have no reason to believe that
Hirudora isn't going past Triple Rashoumon and especially past the Third Gate, which specializes in dispersing the pressure.
Susanoo>>>>>Rashomon. So no, it'll plow right through it.
Once Gai opens the 7th Gate, Orochimaru begins to stall him with Leech All Creation.
Then he goes out of it, and Orochimaru either hides the rest of the match, or comes out and gets raped. Not like he'll be able to sink into the ground before Gai blitzes, and begins to ragdoll him.
Orochimaru taught Sound 4 the barrier jutsu so they could become useful during his assault on the 3rd Hokage. The same way he taught Sakon and Ukon Rashoumon. There's nothing fanfic here, unless you're implying 4 random ninja magically happened to know the same barrier jutsu.
Proof? Orochimaru being their master doesn't mean that he taught them every single jutsu they know, nor does it mean that he can use every jutsu they know. Not to mention the barrier requires 4 people. Orochimaru isn't 4 people, he's 1.
Leech All Creation is not only merging with the ground, but also a movement tool. Also, Gai with literally no sensory techniques won't be able to tell where Orochimaru is and using a blind Hirudora is a death sentence for him, seeing how he's pretty much unable to fight after less than 1 minute of Hachimon.
Already countered. Orochimaru isn't fast enough to react to 7G Gai let alone evade him using Leech All Creation. He gets blitzed, smacked around like a
bitch, and then gets one shotted by Hirudora.