Jim made very clear here on the different Jin type of Wck, taiji, and yichuan. After he studies with different sifus or different styles. Also with the SPM.
Also the seven bows or joints handling of Wck is mentioned in the clip above.
https://www.youtube.com/watch?v=J5SVdSR9_vs
One just cannot make claim Ipman has it all in the same time Chen man ching, CC Chen taiji has it all , the same with Wck. Taiji uproot.....
One needs to know what one is talking about otherwise it is a ridiculous expert wanna be.
Btw. Have you ever ever ever see taiji of internal art uproot magic in mma or kyokushin ? Never sorry, those taiji uproot stuffs are just demo.