Star Wars: Rogue One - 11 Biggest Unanswered Questions
10. What Exactly Is Galen Erso & Krennic's Past?
The Question: What is the past connection and history between Jyn's father Galen and Director Krennic?
The Likely Answer: Though the film only vaguely hints at their past in that opening flashback sequence, it is expanded upon in Catalyst: A Rogue One Novel.
It turns out that Galen and Krennic became friends at university and later, Krennic rescues Galen, his wife Lyra and a young Jyn from Separatist kidnappers. In exchange, Galen works for Krennic, researching kyber crystals for an apparent energy project, unaware that Krennic intends to use the research to expedite construction of the Death Star.
Once Galen learns the truth, he plots an escape with his family, fleeing with help from Saw Gerrera, leading to Krennic's demotion.