Did 'Legends of Tomorrow' Introduce a Way to Keep Damien Darhk Around for Another Season?

Legends of Tomorrow has managed to do a lot of unbelievable things with its group of time-traveling heroes. However, in the penultimate episode of season 3, the biggest twist yet might've occurred. This isn't a reference to the Legends purposely letting Amaya save her village and create a huge anachronism. No, instead it's about what Legends of Tomorrow did with Damien Darhk and how the episode, "Guest Starring John Noble" might've managed to turn the supervillain into a kind of hero.