Two general comments must be made. First, there are very few occasions over the course of my life where a major decision to change jobs, leave a lover, change residence or change life goals could be traced to a singular cause. Most life change events had multiple causations, and I would be surprised if ballplayers would be any different. Once I reached late middle age this point of view was easy to sustain.
Second, my favorite baseball book from my youth was Leo Durocher's Nice Guys Finish Last. This was long before I discovered Roger Angell. Since youth, I have learned that Durocher never actually said "Nice Guys Finish Last". The phrase was paraphrased from a sportswriter he knew. Durocher was known to spin his tales as his memory recalled, and would get some facts incorrect. I still don't hold that against him, because it made for very entertaining reading.
Should an author view events as having single causation, I wouldn't hold it against the author and let it get in the way of being entertained.
Catfish Hunter, RIP. Mark Fidrych, RIP. Skip Caray, RIP.
A fanatic is someone who can't change his mind and won't change the subject. -- Winston Churchill.
Experience is the hardest teacher. She gives the test first and the lesson later. -- Dan Quisenberry.