It is way too early to care about the results for other teams. June is when I think it becomes worth comparing, July I look for trade (buying/selling) purposes, and August start to actually track competitors if in a close race
The problem is, Javier Assad and Collin Rea and Jameson Taillon can help you win plenty of regular season games... but they arent playoff starters. Horton was a guy you hoped would be ready to give you 5+ in a playoff start. Those guys might give you 3.
you wrote that he unequivocally should have challenged all 4, and yet one of them was definitely a strike and the model you're using said 2 would have been bad challenges
Let's hope Shaw hits well as a super sub, then can be traded for an OF bat in the offseason (or proves good enough in the OF to give him a job out there)