Because most of his runners are injured now.
I would say because after an initial improvement in their fitness (from the increase in threshold work), his runners generally plateau. See: the Ping sisters, the Loudon Valley team (thank god for transfers, huh?), the tall Texas kid that qualified for Footlocker Bats each year but has barely improved, etc. Even Hunter has plateaued now.
This isn’t true. TME guys have nearly all improved year after year with a Tinman, including Hunter.