This is my new game theory. In the gathering the shadowy figure isn't the UEM. I think it's someone coming to warn them of him. The reason the keyblades don't have keychains is because they get coverted into keychains later by the knights. They were gathering to begin the process. The UEM found one of the conveted keyblades and used darkness to force it into a keyblade form. Now the Terra's yellow eyes talk. I think that the UEM knew his days were numbered and wanted to create a kind of clone to carry on his legacy. I thinks Terra was this "clone". But he betrayed him and went to Aqua and Ven for help. That is the reason why Terra held Ven back. So he could fight the UEM. The DS is like him,a clone that worked out. His name,Xhenort that is why he and Terra look so alike. They are technicly brothers. The reason Terra tells Sora he hate's him is because he used the darkness. The reason why Ven and Aqua look like Sora and Kairi. They are there mother and father. They say the SE took place 15 years before KH1 Aqua and Vens wife were pregnant for one year and hear come Sora and Kairi 14 years later. It's been 15 years since the SE. I thinks the reason Terra's eyes turn yellow is because when his anger reaches a certain point. The darkness within him takes over. Kind of like Naruto with the Kyubi. In his rage Terra killed the UEM. and wounded Xhenort badly. but he escaped. Aqua healed Ven and thinks the fight is over the finish with the keyblade to keychains. Ven and Aqua get married to other people. As a side note maybe back then all the worlds were one. Then Xehnort retunrs seeking revenge. Know that they must protect every one. The three knights split the worlds into different worlds. Once that is done they go and beat Xhenort and send him to Raident Garden. And erase his memorys of the Keyblades. The reason mickey show up to fight is to he may have been possibly a fourth knight. Before Xhenort was beat he sent Ven and Aqua to sleep and sent Terra to another demension with sunset horizons. Where Sora fights him. Eventualy Xhenort gets his memorys back and finds Aqua armor and seals it away. That's my theory. Sorry it was so long.