Don't agree with your assumptions regarding the pecking order at the Cricket Club - clearly if one of the top skaters felt they were not getting the attention that their rival was getting, they would leave.
We have no reason to believe that Brian gives either man more attention than the other, or that he prefers one over the other. Based on how successful both men have been over the past few years, plus their seemingly positive relationships with Brian and one another, there's no need to assume anything else.
That said, I do think that, in general, girls of Evgenia/Alina's age are going to struggle more to get along with one another than guys who are a bit older. Javi has a serious girlfriend, he enjoys going out, etc.; Yuzu is traveling between Canada and Japan all the time, is very involved in Japanese media, is taking college classes (I think?), etc. Both men have a lot going on besides skating, in part because they are grown-ups. Evgenia and Alina are still teenage girls, and it's likely their lives revolve around the rink. It's a tough situation, and Yulia and Serafima both left when they began to struggle against their training mates.
I also wouldn't be surprised if Eteri is much tougher to please than Brian, considering what has been publicly said about her almost-rejection of Polina for not being the right size. Her tolerance for struggles/failures might be lower, which makes the relationships between her skaters more tenuous.
So you agree with me that problems for Evgenia will come from her own camp, from Alina and perhaps, if she recovers from Junior Worlds debacle, Polina, simply because their programs are built to have higher BV and because Eteri will help to win only the one she feels will win ( in this moment Alina). And under these consideration Evgenia mUST win her second championships,or she risks to be sided away.