Currently he stands at 5:
Tegenkamp
Solinsky
Ahmed
Kincaid
Lomong
Current crop in terms of likelihood to break 13 at some point:
Fisher
Scott
McGorty
*only ones above currently on team that I think will do it*
Centro (I don't think he'll get in a perfect 5000m again and his PR will end at 13:00)
Jager (could have done it in his prime with these current time trials format, but I don't think he can anymore)
So if he gets to 8, he'll just need to continue to get talent for a few more years to reload. Maybe by 2030 he'll have coached 10 runners to sub 13?