On Jay Leighty's Wall
I do love the end of Yojimbo, it's one of the best darkly comic moments in film. I love the evolution of the character in Sanjuro though, it caught me by surprise to see the character wasn't just retreading the same emotional grounds even though he was doing (as you pointed out) very similar things. I think the beginning and end of Sanjuro I think are good contrasts to demonstrate this. The beginning is a genius comedic introduction with his typical attitude while in the ending you see a changed man who is hesitant of the old ways and with just a touch of self-loathing. He seems less like a force of nature and more damaged goods.
I think I may watch them both again soon to bring up some better counter-points.