They're fighting where Madara is fighting the kages. Everyone's mindset is in character. either team has no knowledge about the enemy. No restrictions. Go.
They don't know abt dust release?. Onoki flies up and jinton's the whole place. Since they are IC,gaara will start by flying,itachi wont start with ms, and minato has few kunais.
Minato anf Itachi can take this. Itachi can put most of them in genjutsu while Minato does the quick killing. If Minato and Itachi waste time then maybe the kages can catch them of guard. However I think Minato and Itachi are more likely to win it.
IC itachi wouldnt bust out tsukiyomi immediately so theres no genjutsu oneshotting nor any fatal kill blitzing from him.
onoki doesnt give a shit and jintons from the start itachi. like vs sasuke. genjutsus no threat because of sand clones/rock clones and gaaras flight making him out of range.
minato simply cannot damage A. if jinton doesnt work on yata then onokis rock clone touches its back and makes it weigh a hundred tons. then gaara quicksands itachi
The raikage solos minato,rasengan and kunais are laughed at by raiton armour,gaara either solos itachi high diff or with onoki solos low diff. 5 kages rapestomp these 2.