Right. And, I appreciate the different views.
If "explosiveness" amounts to speed and acceleration (according to your and D$'s definitions), why not just leave it narrow (calling it fast with the ability to accelerate)? Why abstract it to another term? To me, that's an indicator the term is really a composite of some of the things you mentioned and I labeled earlier (speed/acceleration + short area pop and so on).
Ah well. If some are defining it as merely speed/acceleration, I've already mentioned Lamar may be the fastest RB we've ever had.