Thread:ShockwaveDude120/@comment-24439896-20191227214125/@comment-24439896-20191228052124

Also it explicitely states on the Big Bad page that the Big Bad is "the direct or indirect cause of all troubles for most of the story if not the story as a whole." So yes, the Big Bad is the reason why the story exists, they're the cause of the problems in it.

The Heavy is simply the villain with the biggest role in the plot. They set the immediate action. The reason why it specifies they're the cause for the series to begin with is because they're the reason the plot touches the heroes.