Hiding inside of Naruto's avatar he can keech of of Naruto's chakra and use Kage Bunshin to try and Shunshin over to PS inbetween clashes.
With Minato inside the avatar, all shockwaves will be comolerely avoided and leave him open to counter attack. Minato's already shown he can mark a battlefield quickly and his Bunshin make it easier.
Then that's a good way for his clones to get obliterated by either:
-PS shockwave.
-Gedo Mazo's AoE Lightning Blast.
As for him evading the shockwaves, nah. If Madara spins his blade (or both) in a 360 degree fashion like he did against Hashirama, he covers the entire area and every direction in a single go. Minato has nowhere to teleport Naruto to.
Before Naruto dies a terrible death? Nope. No Bijuu Dama bar Flash BD is worth using against PS, and even then it'd take multiple hits of that if he wants to destroy PS.
The same Mazo that 6th Gate Gai, Kakashi, KCM Naruto, and the Hachibi were bodying with basically just Taijutsu and Raikiri.
6G Gai, Kakashi, KCM Naruto and Hachibi>>>>Base Minato's clones, unless this is Naruto we are talking about. Even then, Lightning Blast would obliterate them. Another thing the Mazo didn't use against them. Not to mention they didn't even hurt it. Unless Naruto or Minato's clones have physical power above that of Killer B that is, and I'm 100% sure that they don't.
Mandarin 2 + Multiple Toad boss summons can fend it off long enough for the fight.
Madara's attacks span across the entire battlefield. A single swing of his blade would kill each and every summon. Then there's the fact that Edo Itachi is completely free. He'd end the summons with zero difficulty. Amaterasu for the Toads and Totsuka for Manda II. He can keep a clone inside Madara's Susanoo just in case.
If they're hiding in PS then it's going to long fall. With Naruto and Minatos speed, they can easily close the distance and one kills either Itachi or Madara while the other fends off Obito.
The long fall only makes it easier for them to survive since Naruto/Minato won't be able to travel from their position to Madara's Susanoo's previous position, and then kill them after they fall close enough to the ground to actually do anything before they glance at each other (breaking the Genjutsu) and then reactivate Susanoo.
This scenario can be replicated with Kabuto's sound Genjutsu, but it can be broken via Madara and Itachi Genjutsu ing eachother. Though it's still an opening that can be exploited.
Not a large enough opening for them to kill Madara and Itachi before they break each other out and then reactivate Susanoo.
Not with two sensors inside the avatar. All of which can handle Obito in CQC (Minato has a KCC cloak) as well as possible Bunshin that can also sense
Obito only becomes tangible when he's about to warp himself or someone. They'll sense his presence, but they won't be able to hurt him while he takes out one of the toads. Their only chance would be to force his whole body or the attacking parts to be removed from the dimension by hitting them, but regular punches, kicks and weapons can't do that.
He never managed to pull that off against Naruto in their entire fight. The Kurama Avatar is on a much higher level of strength than the Hachibi, it matches mountain cutting strength
Which is irrelevant because when Obito was fighting head to head with them, Naruto wasn't using his Avatar. What's even worse is that Naruto asked B to cover him so he could form Bijuu Dama without getting caught by Obito's stakes (Meaning Naruto can be bound, and most likely will be bound if he fights head to head using his Avatar). It being stronger than Hachibi is irrelevant when the chains bind Bijuu Power. Physical strength has nothing to do with why Hachibi was bound.
So Obito most likely ends up binding Naruto with Outer Paths stakes.