Are you referring to more than the study that "disproves" the Verducci effect or is that all? If you are only citing this article (http://www.baseballprospectus.com/article.php?articleid=19497) you are really misreading the conclusions with a post like that. That study shows that the Verducci effect, in and of itself, is pretty meaningless. Past injuries are most correlated with current injuries. The second most correlated factor for injury to a pitcher (other than previous injury), is increase in pitches from one season to the next - which is a big reason why teams limit innings jumps. It is absolutely not junk science and there is actually evidence, probably from the same studies that you just cited. The Verducci effect is junk but it was never to be taken as gospel as it was more a theory without any statistical evidence beyond some anecdotes, and is not the reason that teams cite 20%. But it was a theory that provided more study that led to more information but nothing conclusive. The other factor, aside from health, is effectiveness. There is a point that pitchers are not as effective, become more fatigued, and become more susceptible to injury. There is a reason that no team, from old school to the most analytically inclined, will let young pitchers take a big jump in innings from year to year. Just because data hasn't been fully collected and proven and full correlation known doesn't mean it isn't there