I guess, for the moment, we can say it's Eteri Tutberidze.
But honestly, there's no real "go-to" coach. It's about finding the right fit--the coach that works for you.
just dont go to one coach, aka Grim Reaper Sokolovskaya
I don't think Tutberidze achieved anything more than Goncharenko with her ladies skaters. Goncharenko matched Tutberidze pretty equally - one has Lipnitskaya and the other one Radionova, one has Medvedeva and the other has Proklova, so that's pretty equal. Tutberidze now has also Sakhanovich but considering that she has been teaching her only for a few months, Sakhanovich's results can't be contributed to her.
Tutberidze trains male skater that have achieved more in international scenes Voronov, Pitkeev, she has Tsurskaya for 2015
Goncharenko cannot teach a correct axel techique that contributed to Samarin's terrible season last 2013,
luckily Samarin has left Goncharenko and is now with Buyanova
That's odd.....I don't remember Lipnitskaya or Medvedeva's incredible axel technique, Tsurskaya's isn't looking so hot either. I do however know Proklova has an amazing 2A technique. So really neither coaches are good at teaching axel, Radionova's is improving although it does have a long way to go. Honestly 2A is almost every Russian girl's worst jump; Lipnitskaya, Medvedeva, Pogorilaya, Radionova, Sakhanovich and Kayumova all have pretty shaky 2As. The only two coaches I know of in Russia who don't teach pretty shaky axel are Mishin and Buyanova.
I guess, for the moment, we can say it's Eteri Tutberidze.
But honestly, there's no real "go-to" coach. It's about finding the right fit--the coach that works for you.
Proklova is an exception, the rest have either a hop axel or no flow jump ala Radionova
Tutberidze trains male skater that have achieved more in international scenes Voronov, Pitkeev, she has Tsurskaya for 2015
Say what you will about Yulia's advantages or benefits but in the end it was Eteri who coached/prepared Yulia to take full advantage of every opportunity granted along the way. That is the key. Not just the benefits afforded but most importantly the ability to capitalize on them and build momentum. This can only be realized blade to ice and in training/mental preperation. That is why I said Eteri is the best coach for teaching competitiveness. She got Yulia to the top despite her weaknesses and made her a formidable contender in any event. Even during the terrible year riddled with injury and boot failures she made GPF and as you pointed out got 2nd at JWC where she was clearly not 100% yet.