Why Repetition in the third book?I

Why Repetition in the third book?
I found it so unlike Murakami that in his third book everybody knows everything. Whether it is Ushikawa, Tomaru or Bobcut. Everybody comes to exact and correct conclusion. Was it so predictable?
Anyhow third book is also repetitive. It was merely the description of the previous events that took place. But as we know that the structure of the book was based on alternate parallel narrative. First two books contains narratives of Tengo and Aomame and third book has additional narrative of Ushikawa. So repetition was required from the point of view of each and every character.