A thought of the title...

Rating: 10/10 (23 December 2004)

Just to bring this up as an idea... The movie may not have been focusing on any particular samurai as the last samurai, but the resistance group lead by Katsumoto as a whole.
Samurai is both singular and plural, you don't say samurais. I think the title was actually meant to encompass the Samurai as a whole, fighting for bushido, and the old ways of Japan, versus the westernization or "Americanization" of Japan.
The movie really does show the struggle of all the samurai, not just Katsumoto, Katsumoto is just the star samurai, since he's the Daimyo.
And yes, this movie made me cry at the end. It makes me wish I knew more of my Japanese roots...