Naruto is WAY stronger than Sasuke right now.

[Honord Sage]

does Naruto have a counter for Susanoo?

Yes, previous chapter 658 Naruto demolish Madara's Susanoo in Tail Beast Form, Heck the Tail Beast also slap the Susanoo.

 

[Mr Hiru]

Itachi's MS is Sasuke's power so he can be complete. Sasuke does not need CM Susanoo to be stronger than Naruto. Nuff said

If Itachi kill Sasuke when the ***** cat was a kid, there would be no Sasuke. Sasuke's life was pardoned from childhood because he was a scaredy cat from the start. So... plot saved him due pity.

Nuff said.