"The List" is one of those episodes which has good ideas and little substance. From the beginning, we know Neech's will is carried out in the death of others, whether it be through reincarnation or command of another. The bodies pile in several gruesome shots featuring maggots and flies.
What else is there? Well, the investigation goes no where and the subplots aren't developed. Without a resolution in sight, suddenly the case is over as the murders are plunked upon a prison guard who was shot by Neech's wife. Mulder and Scully lose all will to push further, despite being overly stubborn in the past, and drive off. And the final scene: Neech's ghostly form appears and takes another victim. Basically, Mulder and Scully dropped the ball completely and missed Neech's very real reincarnation.