The D'arce has many different styles and finishes. People use many different ones for different reasons. Some of those main reasons are different body types, different defenses/troubleshooting, or simply different starting positions. Any master of a submission can explain to you how there are many many levels to that sub. Slightest variations in pressure angle or weight distribution or hip angle, etc. BTW, I am not claiming to be a master of anything, Im just repeating what I heard from folks who are...