To be fair, i forget a lot about Inuyasha, so i probably doesen´t give him the chance he deserve against Zoro. I just don´t remember something that put him on Zoro his level statwise. His regeneration should be not that high, that he can regenerate, after Zorro cuts him in twice and his other abilities... Well, we have a remarkable arsenal of abilities. Maybe he can Zoro catch in his dimension, but that is more speculation. I still give the victory Zoro.