Naruto, he can make at least a dozen KM clones which can outrun all of mei's jutsu. a couple of clones are enough to handle mei, the rest will attack raikage. if he somehow manages to beat all of them, naruto can in the meantime enter sm and make a lot of sm clones, which are capable of dodging the third raikage and have frog kata ( he can make a lot of sm clones, what he can't do is make a lot of sm clones while he has two gathering sage energy).
at this point in time, naruto does not just have quantity in numbers (like when kimimaro killed off hundreds of his kyuubi enhanced clones without being hit once), but also quality in those numbers. so he can overwhelm even kage level ninja. i daresay that if it was naruto instead of madara, they would still have to summon all the kage to contain him.