your argument is starting to sound biased, dont divert from the path please, you debate better then some.the paths are slow they can hit with the sword easily, can be hit with amaterasu, yaska, and the sword. pain has a limit on using bansho tenin or shinra tensei he has a 5 second one, itachi's tech is faster than that and he can get multiple ppl since their formations are always pretty close. itachi can drop also multiple fires at one so he can get 3-4 paths at once.
They can barely dodge an attack like rasenshuriken especially the animal path
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itachi's tecs are not fast, unless your talking about his genjutsu which is useless in this fight, nagato who is controlling the pains would no doubt sense the build up of chakra when itachi uses amaterasu, susanoo would fall to chibaku tensei, theres no countering it for him unless he has help. and besides, he cant spam them altogether or as much as you are suggesting, remember his stamina sucks.