Having seen both of these skaters on TV, both of these girls have a long way to go before challenging the top senior skaters. Mao's triple axel and other triples are somewhat underrotated and fairly small (or at least small compared to Midori Ito, Irina and even MK). Both of these skaters have beautiful style and are finished though their young physiques take away from their look on the ice and there isn't a lot of power flowing from their skating (unlike Tara Lipinski who had a lot of power in her basic stroking).
I think the talk of Mao dominating seniors is extremely premature. She's not going to fare well when her jumps are scrutinized. It seems that in juniors, they are forgiving a lot of underrotations which would be called in the senior events. Or it could be that the judges are harder on the seniors in undervaluing jumps due to underrotation.
All the talk of Kimmie... even more premature b/c she's NOWHERE near these girls' levels.