Loz. He will commit massive Mugen Tenshin genocide ala Doku and the Hayabusa clan. Hayate didn't really do shit in DF5. All he did was teleport out of harms way whenever Tifa approached him and he bounced Tifa back in one instance
Tifa's strong enough in Dead Fantasy to flip over a truck pretty easily, and couldn't get near Hayate. I know she was messed up, but she still couldn't force her way through whatever he was doing to knock her away..
Hmm, Dead Fantasy Tifa using all her materia vs Loz.. That would be interesting.