When are you are training someone for the 100/200m combo at the Olympics and the outcome is an athlete who runs low 49s 400m consistently even though she races them rarely then I think you have a problem. When you take a guy who was a sub 10s 100m guy when healthy and turn him into a 200m specialist and then after the OG’s he runs 2 200m races in Europe in 21+s tells me he cooked the man with his training even though 200m his performance at the OGs was quality and I believe a season PR.
I consider things to be bad when the outcome of training is producing different athletic qualities than what is needed to compete at someone’s potential. Any fool can make another fool tired and that’s Kersee’s training.