I havent seen any sort of actual phylogeny (I only had access to the text
of
the Omni article, but I see there is supposed to be a diagram), but I
remember
it suggesting something like,
-Aves was derived from the sorts of "avimorphs" Feduccia et al love,
Longisquama and Megalancosaurus as examples
-there was a monophyletic "herbivore" radiation, composed of ornithischians
and sauropods from that avian stock and
-theropod lineages represent independent flightless radiations from
increasingly derived birdies.