http://news.soxprospects.com/2017/06/scouting-scratch-owens-callahan-and.html
Left-hander Henry Owens was demoted to Double-A on Monday after a string of poor starts with Pawtucket. For the year, Owens has 60 walks in 69 innings, and in his last three starts he has walked 19 hitters in 15 2/3 innings. I was at the second start of that stretch, when he walked four over seven innings. This was a weird outing for Owens, who struggled for the first two innings, then retired 14 hitters in a row. His overall line was seven innings, three hits, two runs with four walks and five strikeouts.
It was clear from the start that Owens was struggling with his mechanics. He has been tinkering with them significantly since the beginning of the year including raising his hands at the start and going to a full windup. The Red Sox announced along with the demotion that they plan to drop Owens’ arm slot from high three-quarters to a true three-quarters. At this point, something had to be done—even though Owens had a couple strong innings in the start I saw, it was clear something wasn’t right with his mechanics. Owens long limbs mean he has a lot of moving parts than can be tough to keep in sync. In this outing, Owens was starting on the third base side of the rubber, but his foot was landing on the first base side and pointing in different directions each pitch. His arm was also dragging behind, leading to him constantly missing high and arm-side.
Owens’ velocity was also inconsistent, varying from 86-92 mph, but primarily sitting 88-90 mph. He couldn’t control his fastball, and when he was successful, he was pitching backwards off of his curveball and changeup. His curveball and changeup both weren’t as good as I had seen in past years either. His curveball was rolling to the plate and he struggled to find a consistent release point for it, failing to record a single swinging strike against it. His changeup lacked the downward movement it had shown in the past and also didn’t fool any hitters, which used to be something he could rely on even when he was struggling.
I hope Owens can figure it out, but he's closer to flaming out than ever pitching in the majors again.