As soon as the jutsu lands, the kage bunshin wouldn't need to be there anymore anyway, because, like when the real Naruto landed it, the shuriken basically carries through with the devastation on its own after that point.

There wasn't really a sign of struggle from Sasuke the entire time he was fighting oro. The closest thing to it was the genjutsu dimension oro put him in. Oro didn't even pull out his final form against 4 tailed naruto.