@Rodion999999 The 1st section (the butterfly at the very start) makes it so that the hp and sp gets transferred from that fight to the last section. So if your Ryoshu killed them, they are unusuable and just to kick you in the dick, Ryoshu doesn't get buffs from them being dead either.
@Rodion999999 if you are running MD and have the Spiderweb EGO gift it's better to kill the others. Otherwise I don't think there's a point for doing so if they aren't HoS