I believe it was mixing into your oil from the gallery at the #4 cylinder at the rear corner, which would also be where it's coming off the back of the block, and the water was getting sifted out of the oil in your valve cover and into the catch can. I would replace your PCV valve, which is how oil would be getting into your intake if your turbo's seals are good. And the smoke out of your exhaust via rich gas and coolant (smells like waffles) from the #3 cylinder.