Here are all the people minato might have a chance against.
1. Chance of defeating madara 1 percent why hes madara nuff said.
2. Chances of defeating naruto 30 percent why narutos stornger then minayo every possible but hes realy dumb.
3. Chances at defeating itachi 50 percent why itachi has low chakra reserves.
4. Chances at defeating sasuke 30 percent why sasuke cant realy hit minato.
5. Chances of defeating obito 45 percent why minato knows how long he can stay untangable.
Note im not saying he cant win against them