Well in my case, I did train harder and more than what my coach prescribed me at the time. The result was one time no improvement in performance, but stagnation and later when I did it again (increased mileage by myself during a training camp from 60 mpw to 75 mpw 2 weeks) I also got the foot stress fracture and gout because I was eating so much just to keep up. There are many HS kids who do the same, they want to win so badly and perform that they do way more than their coach prescribes are try to crush all workouts and repeats and end up injured or peaked early. That being said, Drew was never known to push it during HS training, he always kept his CV at true CV effort and his 200s relaxed at mile pace.
What speaks against Tinman is, that well Drew is his first athlete on world-class level that is not just a master's athlete or 12-year old girl. Training such athletes takes a lot of experience. Lydiard once said the first 3 super-talented runners he had were just experiments and he failed in training them but used that experience to produce world-class athletes afterwards.