sasori's Poison affects blood and cells not skin....If Orochimaru does get scratched by the poison coated weapons and it start to effect him I can see him saying a lousy scratch like this will not kill me and then he will shed his skin and proceed to busting Sasoris ass.
eh? Iron sand bullets drenched in poison will more than peirce manda/s hide....Orochimaru could also use Manda as a shield because Sasoris little wooden puppets would not be able to pierce the thick hide of Manda and then he could ride Manda and proceed to crushing sasori
Lol the sword of kusunagi is one sword...How is he defending against 100 puppets + Third kazekage + iron sand darts ? Which btw he can controll all at 1 time, kazekage in his hands, 100 puppets in his chestOrochimaru could also use the sword of Kusanagi to block all the poisonous weapon attacks by controlling it remotely and making it windmill right in front of him to block all incoming attacks.