Kind of fascinated at this point with how the choreography of the form (ostensibly flowing from a single source) courses through different body types.
I don't think the gongfu flowing through different body types is the issue here. I think it has more to do with the brain and the social circumstances. Largely these people practice differently because they perceived the teaching differently, and in many cases had less or lesser quality access to the teacher. In some cases they practice they way they do because of health issues.
The first guy (in blue) Zhang Maozhen was older, I think a heavy smoker, and had already had some heart surgery. People would often comment on his poor posture and sort of wilted appearance, but he had likely very good access to Chen Zhaokui and was an astute learner. Chenyu was close with him and he may be the most similar in practice style/appearance to Chenyu among all.
The second, Zhang Qilin, I am not knowledgable about his level of access, but in my view he is not just not that great, with many incorrectly constructed methods and ideas; swaying, leaning, floating, and then empty rapid snapping fajin, just a lot of pathologies. It is pretty obvious that he is mostly sitting anywhere BUT the actual root. Adding the drama of a very low stance is not compelling to me, but he does have good energy/intensity at least. It's just uncomfortable for me to watch.
The third guy, I forget his name. I also forgot his demonstration entirely until I watched this again, because it was on the border between unremarkable and awful. When I saw it again I regretted remembering.
Then Chenyu in street clothes-
this was a local commemoration of Chen Zhaokui I think in Shijiazuang, organized by Mahong. It's a local small situation and I think I remember Chenyu saying something about how he was kind of asked to attend rather hastily and was not really prepared. In street clothes and dress shoes, unprepared, still several dimensions beyond the realm of any of these folks. Even my wife who does not practice this at all watched for a bit and said 'he's really that good isn't he?'
Chenyu in dress shoes and street clothes, like this was exactly how it was when I first met him, at the park in street clothes with the martial arts scene.
I cannot remember where I got the video, but I cut it into sections because at that time MaHong was really promoted to the maximum everywhere as being very important, but he really was not especially good. I did not want to have to watch his long super dramatic presentation every time I watched this video, and I was not interested in promoting him at all. You can see him here: