-Other witnesses/possible suspects in this case:

Great Banban (the booker of the company in charge of deciding the outcome of matches, fellow wrestler, looks suspiciously like a yakuza thug but isn't)

Nezu Inoki (reporter/editor of The Dirtsheet, is intent on being the first to write an exposé on how pro grappling is "fake")

Mako Fuji (unassuming lady who is secretly a massive professional grappling fan, leader of the Professional Grappling Ladies Fanclub)

Kota Misawa (young man who wants to become a pro grappler, claims to have seen the murder)

-All of their names are, of course, references to real pro wrestlers (Giant Baba, Antonio Inoki, Marufuji, Kota Ibushi, Mitsuharu Misawa)

-They can also be read as terrible puns (Nezu Inoki= nezumi= "rat", Mako Fuji can be re jumbled slightly to read "fujoshi"/rotten woman/fangirl, Misawa sounds like= me/I saw it)

-The Striking Swordsman case seems almost unwinnable when there are no more witnesses to call/all theories have been thoroughly shot down by the prosecution, until Naruhodo points out that there /is/ one more witness that can be examined (it's the small, kindly old man that's been holding The Swordsman's megaphone the entire time)

-The old man's name is Hideo "Hidoiyo" Jii--hidoiyo= "that's awful", so his name is a reference to famed pro wrestling commentator/interviewer Mean Gene.

-Naruhodo figures out that "The Dastardly Daimyo" is actually a foreigner, William Catchas--he wrestled under a mask to hide his true nationality. The Swordsman learned about western style wrestling and showmanship from him, and as such respected him greatly (it's heavily implied he had crush on him as well).

- It turns out that Jii is the actual murderer, as The Dastardly Daimyo was booked to win a big match against The Swordsman, and Jii (a former samurai)could not bear the thought of a foreigner being made to look stronger than the Japanese Swordsman.

-After the case is solved, Kei decides to reinvent his wrestling character, incorporating different elements of both The Swordsman and The Dastardly Daimyo in order to honor Will.

-Kei also offers Naruhodo the chance to participate in a match's storyline--Narudodo hastily refuses, but Susato, who has become quite taken with the idea of pro wrestling, enthusiastically accepts instead.