Just joined this site and this my first post. I wish to share something about this species;
I have a property, (an acre), in a relatively rural area of the San Fernando Valley, by Los Angeles. The property has many trees, (mostly native Live Oak), and various beautiful bird species regularly nest here, finches, linnets, etc. This year I am excited to see Orioles nesting on the property. What is amazing is that there seems to be more than one pair, I believe two pair, who occasionally engage each other in the trees. I believe they are Streak Backed Orioles. The males are brilliantly colored with bright orange/red heads. They are magnificent. What is interesting is that the discrepancies you point out in the illustration were noticed by myself even before reading your post, the beak, etc. I watch them cavort through my home office window. Exciting stuff.
Is there any other species that they could be? They do not look like any other type Oriole that might be local.
