Well let's see here, Mizukage took out skeleton susano rather easily with that mist. So i would say it would do decent on armored susano. My wonder is how well does susano's chakra hold up against molecular attacks with such chakra density obviously more than susano's. I mean think about it sage mode is like a 33% buff on chakra and naruto is an uzumaki and yet 2 rasenshuriken is exhaustion. Its pure density is stupid strong, let alone the millions of wind strikes it lets out. How this matters? Defense at a molecular level is virtually un-existent, Also the raikage's punch is a blunt hit with a large surface area, rasenshuriken is a bijuu dama compressed and put into a rotation with a wind affinity so vast that not even the sharingan can see all of its mini attacks as stated by kakashi. This plot no jutsu is something that is on a whole new level to almost any seen jutsu as stated by many people. I think the density of this molecular level attack would indeed shave a whole side off susano and dmg sasuke's cells. Also, if you want to argue the rasengan barrage, naruto used that on different parts on the battle field and was less exhausted than when he uses Rasenshuriken.. so take all of those rasengan, spin them faster add wind blades and even faster spin and put them into 1 point on 1 attack.. You tell me, even if it didn't destroy the whole susano...(even when it expands) i think it would rock whereever it hit and then shred under that point when the wind comes in.