See Charlie’s long-to-short. Kersee’s long period is extended compared to Charlie’s. And remember that Bobby had Flojo and Gail Devers. Also, Shawn Crawford is primarily a 200m sprinter, so he fits with Kersee’s system better than, say, Asafa Powell would.
Kersee starts with starts in early January, alternating between long (gradually shorter) tempo and short accels. The speedwork doesn’t come until much later, but the racing also doesn’t come until May at least.
I doubt that many here would want to train for 100 in that system…but Bobby coached, I believe, 6 medals in Beijing and probably has coached more medals than anybody else.