Rocketech1 is way off. I have a bit of experience with pitchers and even in the SEC they are not fully aware of every body movement. They may be unaware or even sloppy with their mechanics, but only a handful like Barnhill are doing it by design to gain a competitive advantage. To your point for all but a few the issue can be resolved with the application of a minimal amount of focus with zero adverse effect. If the rule was properly enforced those pitchers would make the adjustment in short order leaving only those who seek to deliberately work outside the rules.