Congratulations! The main villain of the JOJOlands is revealed before we're even halfway through the story.

K-Ran said in comment #2642918:

Congratulations! The main villain of the JOJOlands is revealed before we're even halfway through the story.

Maybe Araki realized that he could have handled Tooru being the main villain of JoJolion better, such as introducing him a little earlier than less than 30 chapter from the end.