Some pro runners, good, not so good, bad:
YR: Kerron Clement
BCR: Karsten Warholm
YR: Kilian Jornet
BCR: Anton Krupicka
YR: Eric Jenkins
BCR: Ben True
YR: Galen Rupp
BCR: Yuki Kawauchi
YR: Wilson Kipsang
BCR: Geoffrey Kirui
YR: Evan Jager
BCR: Carl Stones
YR: Cam Levins
BCR: Noah Droddy
YR: Craig Engels
BCR: Clayton Murphy
Generally any runner training with something like NOP, BTC is going to be YR. Excess of GRIT gets a pass, or aggresiveness/history like Murphy. Runners training out East, in small groups or solo (like True) are BCR. NJ/NY TC is definitely YR. Attitude towards training, quality of results vs quantity of resources, interview responses, etc can qualify you as a BCR. Controversially, I would say Symmonds is BCR.