I think law might treat zoro himself, that might increase zoro's chances in contributing in the war, but with the damage and toll from the battle against kaido i doubt he will fight a commander, and marco cannot be there or even do anything about his injuries seeing his abilities effect others slowly compared to his own injuries.. law is the only possible way is through law or chopper..
But factually he is not in a state to fight a commander and this isn't thriller bark zoro still had his bone intact at the end in TB but they are all shattered according to law..now