Well, from what I've seen of season 4, (Awakening the Dragon) Bakura is practically all but forgotten, and Yugi, Kaiba and Joey must fight Dartz to save the world. If u watched the first 3 seasons u would understand the 4th. Kaiba is not a team player, he works on his own with little regard for Yugi, although yugi does a damn good job in keeping up with Kaiba as it is. Joey is one of the "good" guys, Bakura has an evil spirit in him and as far as I know he's not in the 4th season at all. Hope this helps to explain what the creators were thinking.