Movie Gettysburg (1993)

The movie, Gettysburg (1993) has a home page that identifies the 18 "Top Cast" members.   https://www.imdb.com/title/tt0107007/?ref_=nv_sr_srsg_0

Missing from the Top Cast is Jeff Daniels, who is a star actor in the movie, along with other lead actors such as Sam Elliott and C. Thomas Howell.  How do starring and lead actors get omitted from a prominent list of "Top Actors," while more minor actors are elevated to Top Cast?