That's a pretty succinct and accurate summary of the problem that NNVC faces here tryn2makamil. Same with anybody else developing a drug or treatment for Ebola/Marburg - There really is no good way to test it's effectiveness in people - without testing it in people.
And since the people who need the drugs / treatments are not particularly conveniently located, and the countries that they are in have infrastructure issues - that's an added bit of challenge.
And - although some of the potential ethical snags may be been suspended after WHO's bioethics statements of last month - some really basic safety testing (that 'first do no harm' bit) would still seem in order before an Ebolacide II would be pressed into service.
Hopefully - NNVC and the Drs. are getting this all rolling with their old USAMRIID collaborators at Ft. Detrick and this can be addressed in reasonably short order.
IF the Drs. can work the bugs out of the ligands so that they generally do not bind to the decoys that the Ebola virus produces AND more specifically target the real receptor - chances are the 'Cide is safe enough to deploy, and just might be effective if you can get it to infected people before major tissue damage has accumulated.