amaterasu cant burn the sand,neither can a fireball,he needs to see the eye to be able to hit it,gaaa can hide the eye,or just move it if it is attacked,he can place it in spots itachi wont see.
Jinton takes abt 3-4 secs to form,from the time that mist is cast,to the time deva pushes it away is at least that long or a second less,animal summons are smackd away by A and tsunade,the 5 second interval would be exploited. Also mei can make the mist around onoki,to make sure that pain dosent know what he is doing,giant rock golem would smash any summons,A and tsunade handle human,naraka,preta and asura,whle mei kills the animal path. Onoki's jinton would be devastating. Also,dont forget that gaara's sand hail,sand tsunami and these
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can attack multple opponents at once,if he actiuvates his sand hail,it will attack both itachi and the paths,his sand sensing would tell him the location of the paths as well as irachi while he uses his hidden sand eye to face utachi. He can attack multiple targets at once,also a sand storm would impair their vision,giving onoki enough time to hit the jinton,alteranatively,onoki could target the other paths as well.