[QUOTE=SimonM;876066]This isn’t, for me, an issue of whether or not there is more than one groundfighting style, I am perfectly aware that there are several since I’ve participated in three different ones (folk wrestling, judo, jjj) in my life. The issue is one of nomenclature; does something become part of a core art just because one instructor cross-trains in it and then instructs his students in both core and supplement? Or does it remain a case of an instructor who simply has more than one core art or who has a core art and a supplemental art?
I think the latter. Takeshi thinks the former.[/QUOTE]
My point was, bjj has plenty of things that came from Gracie’s previous training, yet no one questions whether it is core to bjj, because it is.
It’s not about core arts and cross-training, but whether new elements are integrated into the system of fighting, in which case their role is specific to that system of fighting, and thus, now part of the style itself.
For bjj, it is easier to make these distinctions, because it doesn’t, in any useful sense, approach anything but getting to ground fighting and fighting from and out of there, but even so, there are elements that, according to your definition, are not brazilian jiu jitsu, but are, by and large, considered by everyone to be part of bjj.
Kung fu styles are intended to encompass broad aspects of fighting, and so it is perfectly rational to adopt new techniques and work them into the system where possible, at which point they become core to the style, where they work, just as happened in bjj.
This, of course, requires pressure testing, which is the thing some schools fail to do.