Even the best coaches have different outlook about skating skills. You are entitle for your opinion.
Sotnikova is definitely the best from the Russian skaters in terms of SS and jumps. And she is young enough to have more room for development. If she decides to stay in the competitive skating, she will become more refined skater. I even love her Swan Lake Ex., but you can see she stumbled a lot with just a simple gliding.
As for Anna, I look back at her GPF and National, I still back up my opinion.
I'm not saying that Gracie is a better skater just in term of SS. For artistic aspects, Gracie definitely needs to work on that. I love Radionova and Sotnikova. But I can be a person who can appreciate other skaters quality as well and not being over the top with my favourite that's for sure.
She is the oldest among Russians, but still younger than GG. With age Russians will overtake GG almost in every aspect of skating.