Wouldn't it be easier to isolate a few things that one can do both externally and internally and simply discuss the differences? The distinctions, IMO, should be pretty clear to anyone who is honestly interested in the discussion and not just here to pick apart someone elses choice of words. For instance, simply receiving/resisting a push to the hand. The way someone interested in the internal would do this is significantly different than how someone with normal athletic or strength training would do it, regardless of their level.
Sure, I think some topics of conversation could be:
using ones own weight
the role of breath
the opponents weight/mass
from there i think it would be appropriate then to move on to push tests, or simple waza.
Would anyone like to discuss some of the above?