Who Uncle Eddie isn't -- -- SPOILER
Uncle Eddie is not Stan. Stan is not Uncle Eddie.
I know this contradicts the popular "Fight Club" theory. I think many grabbed onto this before they got to examine the DVD and because of the weak ending.
Below are the facts I present in Stan's defense.
1. The man that followed Stan, and who Stan chases into the darkness is clearly, I say again, clearly the same man that is shown applying the tattoo to Sandy's back (matching sweater) shooting, stabbing, then shooting again, Stan. It is the same guy. He is Uncle Eddie.
2. Some will make the illogical leap that it was all in Stan's head. Who shot and stabbed Stan? And who did his partner shoot 3 times at the end? Is your answer to all these questions really Stan?
3. Is Stan a skilled painter? Does he have a split personality. Is his split personality a skilled painter? Is his split personality a skilled butcher of men?
4. Some have pointed to the flashbacks showing him killing Crystal as proof that he was Uncle Eddie. But the flashback in which you see Crystal being stabbed is from the perspective of Stan viewing the crime not committing it. A photocopy of a news article featuring Stan was left at the scene. Did Stan leave that for himself? Crystal was Stan's friend. Stan admitted to Sandy that he should have warned her to stay off the docks that night. Isn't it more likely Uncle Eddie was taunting him and attacked his friend Crystal as a way of getting to him?
5. Who put the tattoo on Sandy's back? Recall the conversation that Stan had with the counselor at the Narcotics Anonymous meeting when he went looking for Sandy. The counselor said she was clearly not sober and her sponsor took her home. Definitely not Stan. The tattoo scene clearly shows the killer - Uncle Eddie - applying the tattoo to Sandy's back, forming the DEAD anamorph. That was not Stan. He was driving to the location. How can this be explained away?
In conclusion, are we really to believe that the man that Stan chased, who was Sandy's NA sponsor as verified by the NA counselor, who was shown applying the Anamorph "Dead" tattoo to Sandy's back, who was shown shooting and stabbing Stan, then was finally shown being shot 3 times by Stan's partner was really just a figment of Stan's imagination or a split personality? Fight Club screwed with everyone's head, but they did reveal it at the end. This movie didn't.
Isn't it much more likely that the actual man shown doing all those things was really the killer known as Uncle Eddie?
Pardon the redundancy in this post. It helped make the point.