I don't think most Japanese media is as concerned with fitting things into a canon as much as American media is. Like, in Gundam, you have 0079, Thunderbolt, and Origin all allegedly in the UC canon, but there's pretty significant deviations in Thunderbolt and Origin from 0079 so they're not really the same timelines. American comics will also have multiple timelines or universes, but they'll make it clear which one each individual series goes with, and have crossover events explicitly acknowledging the existence of the different canons. Japanese media doesn't tend to do that, and I think trying to fit it into a coherent timeline is a fool's errand