Why does Michael Lewis begin the book with the story of Sergey Aleynikov? How do the major themes of the book show up in Aleynikov’s story?

What qualities, aside from being nice and Canadian, make Brad Katsuyama a compelling protagonist and a worthy leader of the project that would become IEX?

What qualities make Ronan Ryan an effective counterpart to Katsuyama? At what points does he most clearly show his value to the project?