Minato is very much high kage level, he can beat
Muu(he becomes visible to attack so teleport Dust Release elsewhere, throw kunai at him in the sky, he dodges and then teleport to it and end him),
Onoki(same with Muu),
Second Mizukage(find clam by finger on the ground and destroy it with the Bunta sit on it technique, teleport second Mizukage's fast clone elsewhere with ST barrier then seal the weakened Mizukage since Rasengan most likely won't work,
Third Raikage(teleport elsewhere and summon Eight Trigrams Sealing throne, come back and use ST barrier to send him to that location when he attacks again, teleport to that location as well then seal him) ,
Hiruzen(by what we know, not a match though by hype...He can't)
Hashirama-
ST barrier forests away, summon Bunta to evade them as well and close the distance while destroying Sleep inducing flowers with water bullets, sitting on them or oil that can be set on fire by explosive notes.
To deal with genjutsu of darkness, simply find him with the finger on the ground, have Bunta jump to his location and sit on it, evading it will be hard as Bunta has a big arse, or have Bunta use oil on his location then ignite it with explosive notes, surviving will once again be hard as Bunta's oil combined with fire as used by Jiraiya was humongous, if he uses wood clones Bunta can oil multiple locations no?
Either that or summon a small toad and mark it, make it dispel then teleport to it, effectively going to Myoboku in an instant, then go to the toad sages, teleport them to the battlefield and have them use their strongest illusion while fending off wood release with large ST barrier, it will knock down Hashi wherever he is,they will sense him, Minato will find him and kill him by beheading.
Probably won't go exactly this way but there is most certainly a chance xd
