If I'm going to be honest, it really seems like Creighton interviewed to accept. Dr. Norton talked about how he reviewed apps in the second week of June, finished reviewing by the third, and sent all the interviews in early summer for Dec 15th deadline. He also stated in the visit day how he fills the class right on Dec 15th and normally doesn't do post-Dec interviews. There were a total of 5 visit days with each having ~40 students. 5*40 = 200 and on the explorer, it states that they make ~200 offers a year.
This is definitely just a shower thought I have during one of my sleepless nights sitting in bed thinking about admissions, but it makes sense. Anything to rationalize an acceptance.