You're partially correct except that if you look at the "recent" billing and all the promotional materials, the 4 of them are always featured and if you watch the recent episodes of the show, they almost all get equal screen time, with the exception of Alex O'Loughlin which is the actual "star" of the show. The bigger question is why is Scott Caan getting higher pay then Kim & Park? It should be Alex O'Loughlin as McGarrett, then the three co-stars lumped together: Caan, Kim, & Park, then the rest of the cast....