In 2012, SOULCALIBUR V was released, the follow-up to a largely successful but undeniably flawed SOULCALIBUR IV. While its base gameplay was mostly improved, the games lack of budget and development time was obvious: a comparatively pitiful amount of single-player content and a roster on the small side was exacerbated by the removal of a number of fan-favorite characters, replaced by their mostly-unlikable children or just flat-out gone. The series lay dormant until 2018, where Project Soul re-emerged with SOULCALIBUR VI; rather than try to salvage what V introduced, they backpedaled, going back to re-tell the first SOULCALIBUR with a few additions from the later games. Welcome to the stage of history, retold.
Source: N4G PC SOULCALIBUR VI review – ChristCenteredGamer