It's all a timing tip, Easily correctable. It's so noticeable. Elongates the delivery on offspeed. Speeds it up on fastballs. When hitters pick up on this now it's all about chasing location vs having to worry about MPH coming in. I suspect this is corrected fairly quickly. Application is much easier than, say, Yelich's major flaw. Yelich used to, in MVP years, have the legkick/slide and a true up/down movement on his bat to time. It's now moved to a "Y" shaped movement. This creates less precision for launch angle/homerun balls. That's not an easy fix at all (still doable years later with tons of repetitive application). That's more the driving force with Yelich's lack of power than any injury he has had. He isn't maintaining the same launch angle as before. Hitting coaches know this. Have likely been through it left and right. Application is tough. In regards to Hader though, it's such an easy fix. I have no worries about him for rest of year. This will be water under the bridge in a few weeks.