Given his problems it's going to take a lot longer than a hot month to convince me he's really improving. That said, it's obvious that whatever mental and physical problems he was going through earlier in the year, most of them related to his delivery, appear to have abated.
Finished the article, Sullivan makes a pretty good case for the mechanical changes with his arm slot having a big impact on his stuff. I like it. Maybe the Sox have finally figured out something that will work consistently for him.