interesting...I would imagine that the cloning process could potentially introduce mutations, but selfing I'm not so sure of. All of those paph delenatii arose from a single plant, and at least for that species, the offspring were very homogenous.
I found a Brazilian grower who talks about walkerana vs. nobilior:
miranda orchids
The Pendentive I had alternatively threw one and two leaves, and sometimes bloomed from the top of a regular pseudobulb, and other times bloomed from those unusual flowering growths with tiny leaves. The funny thing to me is that if cloning introduced atypical plant growth into pure walkeriana, it oughta introduce atypical flowers, but the flowers were still superb...