Really great explanation on why Myers was able to have such a great season last year and how his changeup is really the key to his success, despite not being his best pitch. In a nutshell he has the very traditional mix of a high fastball/low slider that hitters have to account for, but then he brings his changeup into the mix. If you were just to evaluate his changeup based on break and such, it's an average pitch. But when you combine it with his fastball, it has elite effectiveness despite having less break compared to other pitcher's change ups due to throwing it HIGH in the zone and mirroring his fastball which is unusual. Has definitely given me something to think about when you look at pitchers individual pitch grades and stuff metrics, as in Tobias's case why rank his changeup against other pitchers when he is using it in a completely different fashion than the usual arm side hard break out of the bottom of the zone. So now hitter's really have to account for three scenarios with him and they really struggled to differentiate his fastball from his changeup. Bodes well I hope for him that last year wasn't a fluke.
https://blogs.fangraphs.com/the-more-it-stays-the-same-the-less-it-changeups/