I agree with your post but especially the bolded part.
This makes me think it's a mental health/desire to play issue. It's sad to say but many people don't understand mental health issues/anxiety issues...And if he all of a sudden doesn't have a desire to play or wants to back out of everything completely, that'd spark a backlash on social media from fans.
I guess what I'm trying to say is that...if you're Kjerstad and these are the things you're dealing with, there's no real upside in making these issues publicly known. 22 years old, went 1-2 in the draft and just signed a contract for a few million and you're going to open up about your mental health issues or how you've lost your desire to play?
Let's be real, there's going to be a certain contingent of people out there that'll lash out against you. "5.2 million to play baseball and you're depressed? What a loser!" etc, etc....tweets and comments on Instagram, etc.
It's probably best to just keep quiet and not say anything about it if you're Kjerstad and these are the things you're dealing with.