This is the Gao style small frame pre-heaven form. Similar to the one Luo de-Xiu teaches though the 5 dragons (swimming body portion at the end) is quite different from what Luo teaches. I like this form but find the large frame of Gao style better for health though both are very good and I practice both.
@@samisinspace3682 Basically, Gao Yisheng taught the large/long frame to students who were larger (more body mass to play with) and the small/short frame to smaller students (faster). I don't have a particular resource but it's a topic that's discussed when talking about the Zhang Junfeng Yizong line in Taiwan (Luo Dexiu being probably the most famous exponent at the moment). A good example of the division between large and small frames is the difference between two of the Hung brothers - Hung Yixiang (big guy, better at Xingyiquan) was taught the large frame (which is mostly what Luo has shown publicly), whereas Hung Yimian (smaller guy, better at Baguzhang) learned the short frame (which is what Allen Pittman teaches, at least post-heaven, I haven't yet seen his pre-heaven palms). Most of the people I've seen practicing in the PRC do the small frame. In Taiwan, there's a big of a mix. I study with Luo, and he teaches both frames, although not necessarily in the same way that others do it. Final note - OP says "5 dragons". The sequences at the end are actually "Black Dragon Waves Its Tail" (烏龍擺尾). The 烏龍 (black dragon) and 五龍 (five dragons) sound very similar - hence the confusion. I once misheard "Dragon and Tiger Cross Paths" (龍虎相交)as "Dragon Five Bananas" (龍五香蕉), so OP has my sympathies haha
We don't know what DHC looked like though. All we have is a painting that no knows for sure who drew. Sun Lutang, Yin Fu, Cheng Tinghua, Ma Gui, etc weren't huge. Lot's of internal guys were "bean poles"
You don't need speed and power to determine that the form has something. If anything the smoothness, frame work the control of tempo and momentum is what determines that it's good. Power and speed are only demonstrated for a split second but does not show how it connects to the next movement.