That's mixing correlation with causation. The cause of his success last year was improvements made to his curve and change, making the former borderline plus and the latter borderline average. He also improved his fastball command and velocity, which allowed him to get more swing and miss out of his curveball. His control has generally been fine. I haven't seen him pitch yet this year, but my guess is what's happening to Lopez is similar to what's happening to Jungmann. His mechanics are off for some reason (maybe trying to overcompensate for the conditions in Colorado Springs), leading to spotty fastball command, leading to over-reliance on breaking stuff that he can't get over the plate and can't get swing and miss on out of the zone. Which is not a good plan in Colorado. Or anywhere.