I'm not saying to do it yet, but the one with so much shell missing will definitely have to be assisted when the time is right.
See, as they normally spin and zip the egg, they are pressing against the other side of the egg. This duckling now has nothing to press against, no resistance, so you will have to do it.
watch for the veins in the membrane to become very thin, basically transparent. You will want to start where the air cell is/was. The pic looks fairly sloshy inside there, and in my experience, there's a reason she kicked it out of the nest. But it's always worth the shot of trying, as long as you are prepared that something "could" be wrong with the development. Broodies use their instincts!
Oh and as you found out, oil stays moist much longer than water, and also makes the membrane nice and clear.
best of luck!