lol? No. Danzo fight MS Sasuke is when he got the lvl 3 Susanoo, he was still capable of fighting so he can fight SM Naruto. MS backlash isn't going to be a factor in a fight that is only going to last less than 5 minutes.
-SM lasts for 5 minutes.
-SM Naruto can only use 3 FRS before running out of SM.
MS Sasuke's V3 Susanoo tanks FRS as V2 was able to protect Itachi from Kirin, a far stronger attack than FRS (As it leveled a Mountain sized building) Or he can counter with Enton, which will consume the FRS making it become pure flame.
After SM runs out an arrow take him out, or when Naruto is wide open (Before SM runs out) Amaterasu kills him.
SM Naruto is not beating MS Sasuke.