It is not draconis but a kind of virgineum/kontumense that comes from Moc Chau etc... In fact in culture there are not so many plants of virgineum/draconis/kontumense, and williamsonii/cariniferum/schrautii, but from wild plants, we have a lot of impossible to sort out plants.
There are even some mysteries, I bought back the dendrobium daklakense used to describe the plant, but none ever came again. Same for dendrobium vietnamense, I bought one division ( the remaining is in Germany as far as I know), never appeared again. Dendrobium bellatulum, margaritaceum, christyanum, always come mixed together, even two species growing in the same clump, but each species bloom after the flowers of the previous one are long gone, and the flowers of the next one are not yet formed. We usually have first bellatulum, then margaritaceum, then christyanum...
The nobile is indeed very good. The Vietnamese nobile are amongst the best nobile you can ever think of, especially the ones from the north-north, Cao Bang, etc...