I think its because Wakaba and Kaori are thickly built and do not appear anorexic.It is interesting to see that when Kaori and Wakaba struggle with their jumps, people here are openly talking about weight gain, while weight loss/weight gain/body change seem to be a taboo to talk on this forum most of the time. I personally think these terms are just neutral words if they are based on the pubic's observation. And there is a stronger correlation between losing weight and gaining jump consistency/ability after a skater passes puberty. However, if the same observation is made on some other skaters, the suggestion of losing weight might be labeled as promoting unhealthy eating habit and so on...