Soul Calibur 6 came out after Tekken 7 has finished it's console release. Weirdly enough, Tekken still see some arcade releases while the Soul series started concentrating on console releases with Soul Calibur 4 and recently via Steam with Soul Calibur 6. Tekken is undoubtly popular, with the recent Tekken 7 is a commercial and critical success. But Soul Calibur has a strong following, and that's the reason why Soul Calibur 6 is possible after the development of Tekken 7. The Soul still burns. :D