RE: caroline & azzi -- since they're frosh, they are expected to improve significantly, and they did (bravo!), but it's hard to judge how much they improved because we don't know where they started -- plus both were affected by major injuries.
RE: nika -- i, unlike some BYers, believed she was damn good last year, so her improvement has not been extreme. in fact, i was kind of hoping she would boost her game even more (sophomore jump). but she has been dealing with nagging injuries all year, though hiding it, so i understand. She was a big contributor, like last year. Improved? Sure. A super surprise? No.
RE: Liya -- hard to judge because she regressed so much from her freshman year ... does her current great play represent simply a return to her prior self, or a real improvement from it, which i believe to be the case. A recovery or an upgrade? To compare it to others' growth is a no-go for me.