@Seraphic_Sixaxis
They are direct sequels, but they are spinoffs in the way that they change the entire core mechanics of the main series, which always have one or two points in common, at least.
The story may have been a direct continuation, but everything else would fall into spinoff category. I think it may not be fair to call them full spinoffs though, that title is reserved to the Crystal Chronicles saga, Mystic Quest, Dissidia and now Versus/Agito/Haerasis
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