:::::1.) I am fine with the removal of the sentence about ninjato. There was no source supporting it, and in all of your edits, I missed that one. When many small edits are performed, it's simpler just to do a blanket revert, but sometimes things get missed. 

 :::::2.) You obviously have not read the source. Your opinions about whether the particular school is a good one or not are irrelevant. Here is a quote from the source:  

  
 :::::"With these swords, we tested the effects on the blade of cutting through copper, forged iron, pig iron, and dried bamboo; and of striking to the back, the side, and the cutting edge of the blade while it was secured to a pedestal. 

 :::::"In the blade-on blade experiments, sparks flew from the katana used to make the cut and a deep crack was cut into the one receiving the blow.  

 :::::"It is very clear that blocking a cut on the edge of a blade in the kumitachi practice is very dangerous, and receiving it at a horizontal angle could even threaten the practitioner's life." 

  
 :::::3.) Your opinions of nick Evangelista are also irrelevant. If you bothered to read the sources you would see that Mr. Evangelista actually did his research. It is not necessary for an author to be, say ... an atomic physicist to research the subject and write a comprehensive book on it. 

 :::::4.) Have you read the Mr. Miyamoto's book in its original language? If so, are you qualified to translate it? On page 202 it says "The verb I translated as "slap" is haru';: it is connected with hariuke'', "a parry effectuated by slapping with the flat of the sword." 

 :::::5.) Just because someone forges knives doesn't make them unqualified to forge a sword, nor to write about it. 

 :::::I can easily locate more sources. Your solution is simple. All that you need to do is find a source that recommends blocking and parrying with the edge, and we can adjust the text accordingly. Lacking that, we (the Wikipedia community that is also watching)cannot simply accept your word that the sources are full of crap.