For me it's two sides of the same coin - you need to have the knowledge/information know-how and know-how-to, as well as having the work put in to gain the skills.
Input on one side,
output on the other.
To use a totally screwed up tennis analogy... imagine you are a talented player and you train hard. You look to enter the French Open (played on slow clay) and so you hire a coach. You hire John McEnroe. He's experienced, a grand slam champion, one of the most skilled (know-how-to) guys to ever pick up a racket.
But he coaches you in what he knows and what his know-how-to skill set was most developed in - how to play serve and volley... a tactic that works great on fast courts. You train hard, use his information and develop great serve and volley skills. Then you get your arse handed to you in the first round of the French Open, where those tactics just don't fit with the conditions.
McEnroe's great, but you'd have gotten better information from Jim Courier (a French Open winner, but someone who's career overall doesn't match McEnroe's).
Basically, I'm saying that how much work you put in is really important, but so too is the information you get to use when you put that work in. So the info inside of a WCK system is just as important as how hard you train it. In that sense, I understand that people might want to protect their info if possible.