I believe it's none of the suspects. But it's from the team that got hold of the Strategic Mindmap that was located in Patrick's Rooftop Room. 

The reason I am saying is that, Patrick already knew that the room would be explored and everything copied from it. He squeezed a toothpick in the door and later when he arrived he saw that the toothpick was not on the door, but on the floor. So the team that investigated what's in the room already had the 7 major suspects.Therefore, RJ, who is somewhat related to this team, already knew Patrick's shortlist and then acted as he had foreseen his list on the episode finale video.  

I think Patrick will utilize his tactic to make RJ feel more intelligent than himself and look for deficiencies on RJ actions. In the end, it's a multi million dollar series and the longer it gets, the more profit it leaves to producers and actors. Therefore, making it longer than needed is something that is at their benefit, of course.