You are comparing a prepared situation to an unprepared one.
A situation where the country is recovered, to a situation where the country is not recovered.
Not only were there not all the samurais, but the country was coming out of a war, you can't take into account the fact that she wants to stay to HELP others and tell me "it's because she can beat him", that's headcannons and I don't buy headcannons.
And yeah, she showed better. Not everyone is a character saved for the end of the manga