Pick your poison: Benawi, Aruruu with Mukkuru, Kamyu, Urutorii... Any of those people will give Munechika trouble. Plus, we don't know if there are new generals that are just as capable. We didn't see Touka this episode neither, so she could a candidate to fight as well.
What I want to know is if Kuon herself is capable of leading an army. If she is anything like her father... well... Yamato will be doomed.