In addition to my Theory #7348, this episode 5 also showed that Partridge is RJ. Hiring an amateur to bug the team's office and letting Jane have leverage against RJ. Come on! RJ could easily slit her throat as he generally does, but no. He preferred to kill her slowly by stabbing and showing his tattoo on his left arm. We know how he likes to deceive Jane to kill someone as if that person is RJ (as in the cases of Timothy Carter and Luther Wainwright). Partridge is not on the list anymore and wants Patrick to kill someone on the list. As we know RJ has no friends, just tools and they are expendable. Maybe someone on the list has that kind of tattoo and he wants Jane to kill him as Jane killed Timothy Carter.

Sorry for my English