Board Thread:Questions and Answers/@comment-37788783-20190213173323/@comment-30499831-20190213184535

The plot of Shadow of Ronin was that Ronin stole their memories using the Obsidian Glaive. Just after they lost their memories, Kai is surprised that Nya isn't kidnapped by Samukai. So, "a few weeks" would be during the pilot before they saved Nya.