Street Fighter III: New Generation

I have a question about Akuma. Everyone keeps saying that after the events of Street Fighter 3: 2nd Impact. Akuma is stated to be capable of "Crumbing the Earth" and point to his move called the Kongou Kokuretsuzan but i look at Akuma's ending in that game, plus i've looked EVERYONE obline. But can't find where it states this move allows him to "crumble the earth" anywhere. IF it exists, where am i supposed to find it???

Is SF6 set after SFIII because it seemed in the trailer that Chun Li was training her adopted daughter from her SFIII ending.