I feel like minato could defeat all six paths, but probably couldn't find out where minato was. Also, it is unknown as to whether minato could enter sage mode because we know very few of his jutsu other than ftg and rasengan. That being said, he does have all of the toad summons at his disposal to handle the other summons. I feel that deva path would not be the most difficult for him to fight given that five second gaps are an incredibly long amount of time for someone who can move at the speed of sound and minato would easily be able to get an attack in. that being said, we still have several other paths to go through, including one that will resurrect the other paths. I feel like he could take the missles and the chakra absorbtion guy, but a dude that steals souls seems like a bit much. Also, as far as we know (which is not very much on minato), unless he can go into sage mode, he doesn't seem to have a good way to find nagato, as someone mentioned earlier. However, because we have such little battle information on minato, i don't think its intelligible to have as many conversations of "minato vs ____" as we seem to end up having because we just don't have enough info. I'm sure he knows many more jutsu, but what are they? how good are they? I doubt we'll ever know.