you never know how much and how a writer's works reflects his mind. so it takes some guess and effort to correlate those.
I would say as i read the Runaway Horses it ominously reminded me of his story but I'm not sure about others --- i haven't read the Temple of Golden Pavilion or the House of Mirrors (?).
Anyway it was a joke and as he made his speech to the soldiers, probably nobody ever heard him as it was so noisy. this is the tragic and black humor part of the samurai spirit or purity. Great authors often live in their own worlds and eras.
i don't find the dramatisation of his works esp. the earlier ones go very naturally with real life story. but well, it is hard anyway. after all, Mishima is a myth.
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