Not to mention Hill and McGorty also have some very quick miles under their belt. I was digging and it turns out Derrick and Bumby actually have faster mile/1500 PRs than Kincaid, Scott, and Hughes, too.
True, but McGorty ran a 3:53 indoor mile under Miltenburg which converts to faster than his 3:36 1500m from last summer (which I would still give Miltenburg credit). Hill was also capable of 3:34 in college.
I would say people in the group who have ran fast 15's due to distinctly Shumacher's training would be of course Houlihan (3:57), Quigley (4:03), and Jager (3:32).
Centro could maybe run slightly faster (3:28 high - 3:29), but he was already training at such a high level with Salazar. The only benefit from BTC is that he has a bigger group to train with on a daily basis. At NOP, Murphy, Engles, and Jenkins went to Julian, Mo left, and Galen went to the marathon. He occasionally trained with Jenkins and Murphy, but not a ton. At UW, he only has Prakel.