Salazars group is, yes with out a doubt, look at the huge improvements made by his runners from a couple of months of training with him. that just doesnt happen.
Schumachers, no they are not. Most of his runners have gotten worse since joining his group. Teg has not improved. Lomong has gotten worse. Same with shalane. there are the same huge improvements with his group as there are with salazars...