The thing that gives me comfort, page-8

I'm new to NXR (traded it a few times before today), but would have thought that the DD was pretty much already done before we got a our first piece of WBT (as noted in April 1, 2014 announcement). Seems to have been kicking each new milestone goal since then or we would not have kept increasing our stake. What could have been found out now that would make it fall over ??? That is a question that hopefully some of you old hands can answer.