Since when are they pretty even? Kanako ALWAYS beat her. She came close once because Kanako did badly. Kanako went undefeated the entire season. This girl was beaten by almost everyone, including no names like Shoji and Lam. There's no reason she will be a factor when she move up next year.
So here's what I'm saying though. Last season, Polina was tearing up the junior ranks, Kanako was the only one ahead of her. This season, she had an off-year, but I mean, it happens to a lot of people, remember Mirai in 08-09 when she finished 5th and 9th at her GP events and was only 5th at nationals and couldn't rotate any of her jumps? Pretty sure she's a force again now. So there's no saying the same thing won't happen to Polina, especially if she can make a splash next season when Tukt and Sot are still too young and skaters like Rosa, Anna, Polina A, Sofia, etc might still be really inconsistent and/or fighting puberty monster.
Also, Adelina's jumps are frankly enormous, especially considering she is quite the small girl. Her 2a-3t looks like some pairs throw jumps. Liza's jumps are not as big, but the technique is textbook and really she is such a great performer, gets into the nuances of the music. And if you are worried about their consistency, have you seen this performance by 14 year old Yuna
http://www.youtube.com/watch?v=ZacRA9DqSo0 , or this performance by 15 year old Mao,
http://www.youtube.com/watch?v=SJLl0XQdSxo&feature=related ? Those were at big competitions too, the JGPF and Jr. Worlds. Adelina has never skated like that this whole season, and Liza did only once, at her first JGP event. When you really think about it, Mao has never been that consistent and yet she is still consistently among the top skaters in the world. Liza and Adelina will most definitely be forces on the senior ranks, probably their first season out, if they continue progressing the way they are currently.
And my point about Polina is that you never know what will happen in the coming years. She is talented and driven, and I wouldn't be surprised if she pulled a bit of an Irina in coming years. Here's Lepisto in 2006, age 17,
http://www.youtube.com/watch?v=Xj7YGO0Iz8A. Polina, regardless of how many no names beat her this season, is still better at 15 than Laura was at 17, and I'm pretty sure Laura medaled at the last worlds and has medaled at Europeans 3 times, and won once. So really, it's foolish to count someone out at age 15, especially when said skater has a lot of talent and big jumps like Polina does.