Yep...the article in my opinion is spot on and gets the gist of it. One can also make a point that Oyama's Japanese karate was a formative point to bring technical use to an emphatic point in their tournaments. And from there others were/are trying to branch out to fix holes they felt needed fixing in that study.

The one thing that this brings up is that Kyokushin's requisite use of full contact, even though not as open technically or in the ranges of its combat (grabbing, head shots and grappling) it did allow for quicker access and a quicker learning curve from these Kyokushin players, apparently, to get into more open style tournaments (read full contact kick boxing with MT rules and MMAs) that did allow these things.