I think pendentive has been selfed a few times before. As far as I know the seedlings all look rather similar. I don't know if ''dorothy'' is one of its seedlings but it looks almost exactly the same as pendentive. I have both and I need to look at the lable to tell them apart.
That's interesting. So it indicates that the Orchidglade was a late generation natural hybrid (i.e., not the recent cross of two parental species), or it is actually a mutant of C. walkeriana. It is interesting that the offsprings inherit the top flowering character (even after backcrossing to C. walkeriana).
This plant blooms both from leafless and leafed growths. My walkerianas do the same. It all depends on how much water they get. During times of drought, as in nature, no leaf is on the flowering growth. When water is more frequent, the flowering growth produces a leaf as well.