Hollow Nozuchi is a bit confusing, in that it can't be assigned to a hotbar, and must follow Hakke Mujinsatsu. Does the Hakke button change to Hollow after being used in a Doton?

If it happens simultaneously with Hakke, it wouldn't need it's own 1.5 sec CD, which implies that it's a separate action. If it is, it's damage falloff after first target would mean a DPS loss over just looping back to Death Blossom after Hakke.