This is one of the most amazing in-depth posts I've ever ready especially on the topic of friendships which are very complex. To that I say thank you sir. I can understand why your father was so upset over his situation. And I really did kind of forget about the Diana factor in all of this between Alina, Evgenia and Eteri. The dynamics are very tricky and very sensitive and very complex.
Thank you again Moriel for opening up like you did.
Welcome, its not really a big deal, but sometimes people kind of forget those details and just treat it as "well, there is a coach and then there is a student", and forget stuff like Zhenya even staying at Eteri's place in the beginning, the whole situation where a coach has a brilliant student of roughly same age as her own child (i can see how those things can get stingy too), the time all those kids spent together, and all sorts of different interactions they had. Its not just professional, and its just so much more complicated.