I don't know, but to my knowledge the Onoki asked Tsunadae to give him more chakra from one last strong attack, and that's when he used dust release, than Gaara imprisoned Madara, but he escaped by using sunanoo final form to get out... So by that, I would think Onoki is basically out of chakra, and the rest would be quite low, so I think the only person to finish him off of the Kages would be Tsunadae but I do not see that happening, So I think Sasuke, or Itachi would have to step in, if not All the Kages would not stand a chance at all given the facts they were drained before final susanoo, plus he was just toying with them.