Minato may be able to win against Nagato, but definitely not against 6PoP+Nagato or even against 6PoP.
Unless you're talking about KCM Minato, in that case.. He'll probably would be able to win Nagato or 6PoP by High Diff, but not against Nagato + 6PoP. Everything's got a limit.
All he needs is the fact that his speed is above what the Rinnegan/Sharingan can follow and that's enough.
Except ST is basically the perfect counter for speedsters ..ST, Then preta path gets rid of kcm .. or BT and preta
Then preta path gets rid of kcm