Re: MS Sasuke vs SM Naruto
I've always felt that the Sasuke who fought Danzo was slightly stronger than the Naruto that fought Pain. Still if Naruto decides to use frog song, Sasuke will have to fly away on his hawk to escape the sound waves or else he gets owned.
Susanoo can pretty much tank most of Naruto's attacks but the FRS will do some damage depending on the stage. I think FRS destroys V1 susanoo but it will take two FRS to destroy a V2 susanoo and three FRS to destroy a V3 susanoo. Still Naruto can't spam FRS in sage mode unless we are talking about Naruto with the Kyubbi's chakra which should be excluded.
Naruto can avoid amaterasu by using bunshin feints but amaterasu will spread and destroy multiple clones. Sasuke can also control those existing black flames thereby killing more clones and summons.
Once kirin is prepped, Sasuke would dish out even more damage. Susanoo arrows can probably be dodged by SM Naruto but he could still take out boss summons and a line up of clones.
I already made a thread saying that a rasengan barrage will have a minimum effect on susanoo so that spam move should be put out of the equation.
Also Sasuke doesn't have to rely on the susanoo at the very beginning of the fight as I'm sure he can hold his own for a while even without it. If Sasuke uses chakra resourcefully, he should win this albeit with extreme difficulty. Stuff like basic chidori techs such as chidori senbons, chidori nagashi and chidori sharp spear should also come in handy at times when Sasuke wants to preserve his chakra. If Sasuke manages to paralyse Naruto, the fight is pretty much his.
Still if Sasuke doesn't use susanoo he will get overwhelmed by shadow clones, frog katas, rasengan and rasenshuriken so he will definitely need to pull it out for a long duration of the fight.