Kages to date, alive or dead - Minato
Current Kages - Either A or Onoki, which of the current kages could beat them? It is touch for me to decide between them because Onoki can fly so he can just go way up in the air and start spamming his Kekkei tota, but if he doesn't get up in the air in time then A rapes on the ground.
On the ground the other kages can do nothing against A, he beats Tsunade easy, Mei easy (I know she has two KGs but how would she be able to hit A when Sasuke with the sharingan can't even follow him?), Gaara it would take a little more time only because he can slow A down with his defense but it wouldn't be enough to stop him, and Onoki on the ground also can't move fast enough to hit A.