I've never seen "dynamic" to mean something other than dynamic range when it comes to audio.
@amirm care to weigh in?
I wouldn't nitpick this on a subjectivist forum, but since this is an objective science based forum I thought it should be clear when we're using terms that have concrete definitions. BTW I have no issue with the test you propose, I do think the test would be more telling if DnB and other such electronic music did have true high level dynamic range where the driving bass track was at a louder level than the rest of the music since that would not only test the "ability to transfer energy" but also the capability of the speaker's dynamics and also test the speaker/amplifier interaction since there is a lot of power in the bass and to see if the amplifier was clipping at any point.
==========================
Now this part not addressed at you specifically Thomas Savage. I know many subjectivists take issue with the algorithm that the DR Loudness database uses and some of them are legit complaints, most of them are just hand waving away results they don't like.
Another app that will let you visualize dynamic range and crest factor is MasVis, which is free.