I would argue that football is different in that many plays require fast reaction time. I can see how using a stimulant would be a benefit in that scenario. A pitcher isn't relying on reaction time, mostly just mental strength which a stimulant might hurt by increasing neural activity. I took it in college for a few all-nighters, and I found the positives to be mitigated by the negatives. Perhaps it is playing into his success and I'm wrong, I'm not a Dr. in neural, just taken a few classes on the brain.