Do you really care what it
looks like if it works? What something looks like is a "style" ...good for making movies. What works is a system. An effective system is ...well,
effective!
As to what these principles are... If I can use the DTE-MMA group as an example, since I've trained some Escrima with them, I believe that their core principles include:
1. Get an angle
2. Maintain forward intent
3. Diamondpoint
Getting an angle in relation to your opponent involves using positioning, --footwork, distance, and pressure to get an advantageous angle on your opponent so you are striking to his center, while he is not well aligned to hit you.
Forward intent is pretty self-explanatory. You keep the pressure on, even when retreating. Forward pressure is a more limited application of the same idea.
Diamondpoint is DTE head-coach Martin Torres' term for instantaneous, pin-point transition from one movement to another, or to put it in Wing Chun terms, minimum movement with maximum efficiency.
Beyond these three core principles, there are more, somewhat more specific concepts. One that comes to mind just now is when possible, use
short-power. That would be to develop proficiency at explosive, short-range, non-telegraphic power generation. Like the one-inch punch. Or, in DTE, like Escrima master Rene Latosa's well known short, powerful punches using principles from boxing and
cadena de mano.
Now how you could differentiate these principles from WC, Lau Gar, or Cadena de Mano integrated with MMA in the ring? Hell if I know. They are fighting principles. They should be somewhat universal, right? Maybe that's something we forget when we get too hung up on style.