I figured Akagi and Okita were going to show up to reach Tsukumo, but only after Ryouma and Oryou had shown up first, driven away Izou and saved Tsukumo. I still think they are going to show up because Okita is going to get hobbled by Akagi being weakened due to his state of being becoming rendered in flux due to Tsukumo's injuries, and not being able to fight at full strength because of that.