Joel, they have the same influences because they read the same books, studies, articles, etc. If you want to argue about interpretations you can contact them directly.
I have a question though:
Where is the science regarding high levels of fitness across broad time and modal domains?
Decathlon would be the closest sport, the only problem is that 1500m is the longest effort (hardly long in the grand scheme), there is no strength component, and power component limited to throwing (ie, no clean or snatch). Don't get me wrong, Deca is one hell of a sport, but it doesn't cover all the bases we are looking for, so even studies and experiments done with deca athletes would be lacking for our purposes.
But, if they exist, I'm very interested. I'm thinking some type of study that formulated the best methods to achieve triple body weight deadlift, 50 consecutive chinups, sub 6 minute mile, sub 20 minute 5km, double body weight clean ... all in the same weekend. You know, something with substance and relevance.
I'm looking for exact article titles and/or page numbers.
Thanks!