Round 1:Hashirama and Madara(both alive version)
Round 2

RSM Madara
Round 3:8 Gates Gai
Round 4:Toneri
Round 5

MS Kakashi(no time limit)
Round 6:Vote 2 Sasuke
Round 7:Vote 2 Naruto
Round 8

RSM JJ Madara(No rinne-sheringan)
I'm gonna assume he got the same amount of power Kakashi got.
1. Hashirama and Madara win. Naruto has RSM and even he wouldn't be able to take Chojo Kebutsu and Madara's BD Barrage without taking some damage, so imagine what happens to Minato if he receives it. :lol Hiraishin is useless in that manner since he can't evade a widespread attack like that. All Bijuu Dama are caught or redirected courtesy of Hashirama. FRS and variants are useless. Outside markings are pointless since he needs to touch SS/PS to warp Hashirama/Madara away, and their widespread attacks prevent him from getting that close.
2. Madara beats him. He has Rikudo's power from gaining Indra and Ashura's power and he has the Dual Rinnegan and he has Sage Mode. And he can't sense Limbo either since he doesn't have Shinju
3. Minato wins this. His Avatar should protect him from Evening Elephant, and he can teleport away to evade Night Guy once he sees Gai prepping it.
4. Minato wins. He can block Toneri's regular attacks, dodge Golden Wheel, and Toneri can't defend from a super BD.
5. Avatar>PS if they've received the same power, in raw power anyway, but due to Kamui Shuriken Kakashi would win in close quarters. Bijuu Dama gets warped by Kamui Shuriken, but Kakashi won't be landing anything on Minato any time soon. So Minato probably outlasts his Susanoo and then ends him.
6. :lol Sasuke shits on him low diff. Sasuke's PS can match Naruto after getting a superior boost than what Minato has here. Sasuke is faster than him due to Ameno too. So Ameno+PS Chidori=Dead Minato.
7&8. Not even gonna entertain this or the next match.