It is ironic to me that when asked, all of the professionals and professional coaches I have met (By no means a huge percentage...but notable that it has been consistantly the same) say the same thing when a guru's name is brought up (Usually by a parent who has a cash investment involved); "Huh, who?...What does he teach?"...The pro's that I have met do share a couple of things in common, first they show humility (They understand that tomorrow they may learn something that they didn't know..ala Houses apparent evolvement which has been heavily criticized), while at the same time having a confidence in the success of the program they teach...I've never heard an MLB pitching coach spend any time being critical of others in the same position...Why? They got the gig.
What it comes down to is the dollars of the parents who believe that Jr. is the next Nolan Ryan. I think that each has a knowledge of pitching and if given a talented kid to work with personally could indeed show improvement (With the exception of Dr. Mikle Marshall..but only in my ignorance...I haven't seen evidence of success on that front...but understand that it is right around the corner...after 20 or so years..). As to their literature...I believe that it is what the kid puts into it, he may show improvement...if he "buys' into the program and dedicates himself to learning and putting it to practice...if not, it becomes an expensive coffee table book.
As to House who through his success has become the whipping boy for all the other guru's (Mostly because he said he liked Poor Mark Priors mechanics). He tends to show those traits I mentioned about the other professionals mentioned earlier..he ignores the barbs, he endeavors to instruct, he evolves and sticks with his program while not being critical of others...I'm not an NPA member, nor do I anticipate being one, but I believe it is admirable that his group attempts to train on a large scale basis, about arm health and maintenance (Admittedly for money..but at least his group goes out amongst the masses) and preaches for what is now considered by his group the least injurious mechanics (Of course this will change over time).
I think from a consumers perspective the best guru is the one who has your money.
And there really isn't any hope that these guys won't be brought up in future threads...including "He Whose Name is Unmentionable" on this forum and the much savaged Chris O'Leary (Who may in fact be laughing all the way to the bank because he took all of the harassement from every forum I've ever been on, but managed to direct enough traffic in kids to his own site that he now offers 3 tiers (Read that as payment levels) of analysis and doesn't have to take the dookie from the "Old Time Experts" on any of the forums anymore (The ultimate irony to me
....).