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In all seriousness what did you hear about the ORAS - USUM story elements like multiverses? That intrigued me and yeah they did completely drop it for gen 8 entirely! But yeah normal dev time at least for the past few gens is 3 years. Meaning like early 2019 to early 2022. A Team does every set of generation opening games as well I believe. B Team did SWSH DLC and Arceus I think.