Not enough info on what actually happened.
When writing a murder mystery adventure, a synopsis of the actual murder is needed. As is, much of it is scattered across several paragraphs. I want to know the sequential elements of the murder to be able to visualize it.
Also - what clan was the Ronin in? For my players, I've made him a former seppun... just to make him even less likable to the Ise Zumi PC. (who has issues with the Seppun - and it's mutual).