Christina's 3-3 is much better than Kanako's, whose is often UR or close to it. And Gao does have a jump layout that can challenge Kanako, Kanako's jump layout in the LP is nothing special (no 3-3) and Christina should get better GOE because Kanako flutzes badly and has some other funnky jumps. Their LP scores at the JGPF were only about 3 points apart and at nationals Christina got almost +2 GOE for her 3t-3t which makes a 3 point difference over the 3flutz-2t she did at the JGPF.
As for the Russians, Polina Shelepen I like the least. She can jump but her spins are not very good and a lot of her jumps are really shaky