Paper bombs are not scratching Susanoo if Kirin couldn't and Kirin destroyed a large mountain. 6billion paper bombs won't destroy a mountain.
Back on topic; Itachi would not survive Konans attack because even if he blocks the explosive tags with susanoo he will still fall to his death in the abyss she created by splitting the lake in two.
hmm...I think I remember something like that, I forgot about that, but what was tobi standing on? he can't even fly, lol
EDIT: sorry for double post