He's definitely less fat, and I think that as his size becomes less of an issue to him (he's becoming more drawn in to the game and focusing less and less on his booped-up Stupidworld life), his size becomes less of an issue to Xin, and since I'm an amateur artist (mainly in lab notebooks
), I can tell you that it's hard to draw different people of very different sizes together multiple times. Subconsciously you try and make them all look similar.
Obviously Xin is several leagues better than me, but my guess is that over a long time, that pressure nudges everyone. However, this is entirely my personal conjecture on the nature of art and artists since I never actually went down that professional path, and as such is subject to things like the risk of being totally wrong.