God Rugal is a mixture of "Full Powered Gouki" and Orochi's power, thus the term "God." Shin Gouki is a mixture Gouki at full strenght and Orochi's power. Yes, thx about G*d Rugal. But Shin Gouki already exists : SF Zero series, SF 3 series... No mention of "Orochi" from KoF ; Cap can't use "Orochi 's power". They can and they did. Because Gouki in CVS2 is mixed with it, his symbol on his back if I recall.