How exactly does the passing of power work? I know it makes someone otherwise incapable of weilding a keyblade, capable, but what are the mechanics behind it? If only a master can pass it down, how did Terra do it with Riku? The only thing i can think of to answer this is that Master Xehanort sort of named him a master, but then they just kinda go "A'ight you're a master. Gratz." and thats it. No ceramony or anything. If not, how did it work when kairi touched Aqua's keyblade but not when Sora handed his to Jack? Also, can it be done more than once by a single person?