The Crow (1994)

Continuity mistake: In the scene where Eric kidnaps T-Bird and forces him to drive the hot-rod to the dock, Eric holds a large silver revolver up to T-Bird's head, then removes a black automatic from T-Bird's hand and drops it into the front floorboard. A few moments into the chase we see Eric holding the black automatic to the side of T-Bird's head, and the silver revolver is gone.

Sarah: People once believed that when someone dies, a crow carries their soul to the Land of the Dead. But sometimes, something so bad happens that a terrible sadness is carried with it and the soul can not rest. Then sometimes, just sometimes, the crow can bring that soul back to put the wrong things right.

Trivia: In one of the flashback scenes, we see T-Bird reading from a book - "Abashed the devil stood, and felt how awful goodness is." The book is Milton's Paradise Lost. (NOTE: the line after this sounds like it is also a quote from the book, but it is not) David Patrick Kelly, who played T-Bird was so into his character that he bought an antique copy of the book. It is this we see him holding in the scene.

Question: In this movie Eric came back one year after his murder, but why in the other movies do the others come back shortly after their deaths?