Sotnikova and Tuktamysheva have had 2 years of experience on senior GP and tons of junior experience as well. I cannot fathom how someone could have any doubts about their experience at this point. And they medaled at Nationals, so it would be crazy not to send them to Euros and Worlds. Now, Gosviani has very little experience, but so far she's already made the World SP minimum on her first try. If she makes the FS minimum at this comp, (which of course is not a given, but we'll see), she will have done in one try what Makarova and Lacoste haven't been able to do in many, many tries. If she does so, that should put to rest any questions about her worthiness, at least until Euros. If she bombs at Euros, then fine, send Leonova to Worlds. But if Nikol goes top 6 at Euros, I would keep her on the World team.
Also, I take issue with the statement that Korobeinikova is on an upward curve. She's a very nice skater but her trajectory this season is down from last season, if anything. She wasn't among the top 5 age-eligible skaters at Nationals, so its very hard to imagine her making another team, despite her talents.