My post covers that. Everything I said he'd do in my post is stuff he can do with his feats from chapter 650, minus Naruto's power, including tracking Juubito.
Being able to track lightened raikage =/= being able to land a hit on him, sasukes fastest attack is amaterasu which gets dodged, and if sasuke uses V4 susanoo he cant use amaterasu, just spam enton from his orb which travels slower than amaterasu iirc.
Yet Susanoo still wrecks him in CQC due to the Enton Blade combined with pre cog that let him track Juubito. Senjutsu Susanoo>>>Normal Legged Susanoo..but Juubito>>>>V2 Ay when it comes to speed.
Sasuke can't defend against both of them simultaneously.
If the Raikage attacks Sasuke, he retaliates and hits him with the Enton Blade, and then turns around to hit Mu with Amaterasu or a Magatama. Mu can't prep and fire Jinton in the time it takes Sasuke to land a hit on the Raikage, so this strategy isn't going to work.
Muu preps jinton from behind a
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where Amaterasu can't hit him because he's not in sasukes LoS. If Sasuke targets Mu with susanoo arrow, lightened raikage can attack him in the time it takes to string the arrow and fire it.
That's why he doesn't need to focus on Mu. Mu is irrelevant until he becomes visible to use Jinton, and once he does Amaterasu hits him, and coating the Susanoo with Enton counters the bold, can't touch it unless he wants to catch on fire and die, not to mention there isn't conclusive proof that he can use it. Your assumptions were fair ones to make, doesn't mean that he knows the jutsu for sure.
Amaterasu isnt hitting Mu from behind cover of a rock out of sasukes los. If Sasuke uses shunshin to move to where Mu is in his line of sight, he turns his back on raikage whose lightened speed is >>> sasukes and charges in with nukite and kills him. if sasuke switches to defend himself against raikage with enton blade, Muu obliterates him with large scale jinton.
theres pretty much overwhelming evidence here for muu using weighted rock tech. Its not 100% confirmed that 2nd mizukage can use hydrification, yet people give him that feat because he's part of the hozuki clan; though being in the hozuki clan doesnt grant you ability to liquify (like being in the uchiha clan doesnt mean you have sharingan), but since he is the mizukage (strongest in the village, in theory) and part of the hozuki clan, we can logically deduce he can use hydrification. I'd go as far as to say Muu can use this technique unless proven otherwise. Though the kages dont need it to beat sasuke.