I'm a bit curious about this too because in https://www.ifsmagazine.com/jason-brown-heads-north/, it says Brown was the one who contacted Orser shortly after 2018 U.S. nationals asking about the possibility of training with him. It sounded like Orser was not completely onboard, but Tracy really pushed for it and managed to convince Orser. Maybe that's what it is?
Stephen has always had Orser as the primary coach and Lee as the secondary coach. I don't see that changing especially since Orser seems really invested in Stephen and it's his junior debut year.
I personally would not look into that sentence too deeply, I think only his high profile students are listed since those are the ones most people care about the most, and there's no need to drag in anyone else. I mean can you imagine if he went and listed everyone??? "Orser will be the primary coach of Hanyu, Jin, Medvedeva, Cha, Tursynbayev, Nishiyama, Daleman, Gogolev, Orzel (??).....blah blah blah". Too long!
I read in Icenetwork (I think) that Brown went to different coaches to see who would fit (in the SOI tour) and finally ask Tracy to be his coach, so many perspectives of this.
I also heard that because it was Stephen's first junior year, Lee asked to be his primary coach, maybe because Brian had too many students? I dont know, but cant remember exactly were. Dont know how much truth is in that, thought