ugh, heartbreaking. I can't imagine the toll it takes on the players whose careers don't pan out. Can't help but feel like we often overlook how brutal the sports industry is to a majority of players.
I don't know about this. If you're a professional athlete then it means your career did pan out. Not everyone is going to rise as far up the ladder as they'd like, but that can be said of any field.
I won't comment on Stanley's situation specifically without knowing more, but generally speaking the athletes who struggle with mental health are going to struggle with mental health no matter what they do. The opposite is also typically true. Typically, when athletic success has saved, or at least temporarily re-directed the life of someone battling a mental illness, it is because that sport filled a void that might otherwise get them into trouble.
My guess would be that basketball helped Stanley a lot. It's the finality of graduation, retirements, etc. that tend to cause more issues - and that happens at some point for everyone.