sasuke will dieRight legged susanoo. One question, what happens if he gets caught in atom dismantling jutsu?
Sasuke one-shots Gaara and goes on to defeat Muu with difficulty...
Gaara is a joke of a shinobi, totally reliant on his sand, you go past his sand and you get a common villager.
As battle starts, Muu being a sensor knows shift in Sasuke's Dojutsu and vanishes. Gaara on the other hand, eats full tsukiyomi(Sand ain't gonna protect from that)...
For Muu to attack, he needs to reappear, susanoo arrow would be enough but not on first attempt.
He is back!!Sasuke win ,Because:
Sasuke vs Gaara (low difficulty)
Lightning /lightning variant >Earth/sand
Sasuke have susano as his defense in most part
Sasuke vs Muu (mid difficulty)
Sasuke just need to cast amaterasu while Muu charge for dust release.
If Muu disappear,then Sasuke have go in susano as his defense,because Muu can perform jutsu in that state.
If Muu is flying,Sasuke can summon hawk or activate PS for an aerial battle