He just didn't appear on many photos with them. He was like always far away from them. I don't want to think that the team treats Yuzu badly, I'm just worried about him. He's appeared on not so many photos while the Japanese team have been having fun together and taking photos together. He was also not with them during the closing ceremony of Olympics. He walked along with old doctor though I think it was because of such important reason as respect towards old man. Aslo, I've seen the photo where all skaters stood together but without Hanyu-san. I remember the fact that Daisuke's not admitted Yuzu's wins over him for a long time.
I must say that I also noticed it, especially some years ago... apart from kanako he didn't seem really close to anyone else, but in the last two years it seemed to change IMO, like I saw all the member of team japan interact with him way more often during competition, etc... I'm probably just over-thinking this, but maybe it was something along the lines of the new kid who is VERY competitive (something nearly anyone said about him) and much younger ( and that never helps) and that came in an already strong and well balanced group? anyway I think that even if this was real and not just something that my mind made up, I would say that it has changed and we shouldn't worry about it