Literary intercalation

John's literary strategy is intercalation. He will interrupt the story of the Woman and the Dragon by intercalating a totally different story. 

One can note how the millennial reign is intercalated between binding and loosing episodes in 20:1-3 and 20:7-15. This literary construction is similar to Michael's war with the Dragon intercalated into the story of the Woman and the Dragon (12:7-12). Gerald L. Stevens, Revelation: The Past and Future of John's Apocalypse (Pickwick Publications, 2014), 424, 509. 

This analysis undermines the view that these are sequential events.