Wow I didn't think about this but yeah this makes a lot of sense.Manga MS Sasuke at his peak has Complete Susanoo.
-Susanoo arrows aren't going to hurt him even if they hit him since it took Nukite to pierce him.
-Susanoo isn't crushing him with any kind of physical force since FRS didn't do anything.
-Amaterasu is his only way, but Sasuke can't use it in rapid succession nor can he use Susanoo and Amaterasu at the same time, and his Enton Projectiles are too slow to hit the Raikage. I've heard the "suffocate him with Amaterasu" argument, but all he needs to do is cover his face with his arms, or turn around so it hits his back instead. Nor will it burn Raikage quick enough for Sasuke to last, due to MS Strain. So that just sets Sasuke up to get shanked by Nukite.
-No Susanoo he can form is going to tank Nukite, which is on another level to FRS since the former ran right through him and the latter didn't do anything to him. Danzo's Fuuton blew a hole in Complete Susanoo, FRS would heavily damage it, enough to render it unusable, but leaving Sasuke alive at the very least, while Nukite tears through it like butter.
Basically Sasuke uses Amaterasu, Raikage blocks his face with his arms and then destroys Sasuke's Susanoo.
If we are talking EMS Sasuke in the thread, but with no Enton and Amaterasu restricted. He still loses as Susanoo can't hurt him, but the Raikage can get past Susanoo. He can't overpower the Raikage nor will Genjutsu put him down, not like he'll ever land Genjutsu on him anyway.
Though Sasuke can use Susanoo and Amaterasu at the same time
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and considering the Ribcage is a form of Susanoo, I believe he should be able to use the 2 at the same time
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After your explanation, I think the only legit way for him to win is via Genjutsu which is pretty hard to land here.