At the same time, you're reading a manga here, not a piece of news about high school kendo in Japan. Even if it's a sports manga, you already have a teaching ghost right from chapter 1. So I find it hard to expect the author to be completely accurate about the sport he is using.
Just look at all the sport mangas and how many of them are really respectful of the sport they use, I think the list will be incredibly short compared to those who gives player superhuman abilities (just look at the current Jump series : Haikyuu!! or Kuroko no Basket... or at a lot of older series like Kenichi or Captain Tsubasa). You just can't be as exciting with a perfect description of a sport....
Entertainment isn't always perfectly factual nor i doubt is this manga meant to be taken as an instruction manual.
The only supernatural elements added here is really Kurogane's eyes and the fact that he's haunted by a ghost. Other than that, this series is really showing a normal kendo club in the everyday world of Japan. Same with Hikaru no Go. The series is portraying actual Go in real life, along with actual high school go clubs, national Go competitions, the road to becoming an Insei and so on. In the same way, the standard for kendo shown here is simply normal kendo like in the real world. It's not kendo in the magical world or kendo in the 23rd century. People who have no clue what real kendo is like would read this manga like people who have no clue about basketball would read Slam Dunk. My point is pretty straightforward in the fact that this manga is breaking so many rules of real kendo that it's ridiculous.
Also, series like Kuroke no Basket, Eyeshield 21, and Haikyuu don't really break too may rules of the actual sport per say, they just add elements that aren't really relevant in real life; like extra spices over the main course.
(but some of the element Kuroke no Basket adds, like animal instinct & "entering the Zone", are just so stupid in my opinion. So I actually don't really like that series all too much)
Edited by Saphsin, 12 July 2012 - 03:10 PM.