You would be 100% wrong. The oil only occurs in the dead center of the back of the phone.
I left the case at home in a drawer since I started this post. I checked it last night, and the case was oily. I havent touched it since I took it off and wiped it down a week ago. The case is creating the oil, no question.
I also had our IT guys check the moisture sensors on the phone. None of them are fully red, but a couple had a pink tinge. Obviously, I cant say for sure what made the moisture sensors show moisture––I do live in Arkansas, which can be pretty humid. However, I have never gotten my phone wet. Thus, out of an abundance of caution, I have to assume that the case could be partially responsible and discontinue using it.