So after Halloween 4 set up Jamie as the new killer... then.. Halloween 5 set up Jamie as the psychic girl, Halloween: The Curse of Michael Myers set up Jamie as a mildly important but mostly disposable character so we can get to the REAL important details! Which still aren't quite hammered out, don't make horror movie reviews sense, and differ depending on which version of the movie (blog post) you watch. What fun!
Source: horror movies Halloween The Curse of Michael Myers Movie Review - Decker Shado