Is it, though? Sasha and Anna are 17 this year, and they are still winning over Daria and Maiia. Kamila is the only 14 yo here, and I'd say physically she's bigger (not the right word but maybe more curvy? Developed isn't the correct term either because not having curves doesn't make you less of a developed woman) than Sasha and Anna. She doesn't look like a typical 14 year old figure skater. She's taller, not very thin, but also not pure muscle - she has a fat/muscle ratio in between. Anna kind of has a disadvantage - she's thin but that also means she doesn't build muscle easily, like Evgenia. And Anna also has long limbs and wide hips for her frame which usually isn't great for jumping. She's definitely going through puberty this season.
You're always going to have different body types in skating. If you're gifted like Sasha, you will be able to build extremely lean muscle and be very strong but still have proportionate limbs and hips that aren't too wide. She has probably the most ideal body type I've seen, except for her flexibility. But genetics will always play a role in sports, and it's the biggest contributor when training conditions are the same.