Ira is available for anything and willing to help out wherever he can, though one of his main goals will be to visit as much of the map as he can so he can offer his Dark Corridor services. He'll likely join his mothers, but would likely go after Ales or Hisui.

Ardyn, for all anyone else knows, is holed up somewhere inside Old Mysidia, just waiting for someone foolish enough to go deep into the abandoned city's walls. If they can get past the former residents, first.