Man, this crap about Data Keyblade bla bla sucks really..
DiZ summoned the keyblade for Roxas, in that Data World, you see Roxas was surprised. Terra can summoning his keyblade naturally, and watch the colors, this "blocks", which appears when Terra summoning his keyblade, look blue and yellow. The color of his keyblade. And once again, the appearing doesnt look like when Roxas summoned the kingdom key. Analyze it closer..
DiZ summoned the keyblade for Roxas, in that Data World, you see Roxas was surprised. Terra can summoning his keyblade naturally, and watch the colors, this "blocks", which appears when Terra summoning his keyblade, look blue and yellow. The color of his keyblade. And once again, the appearing doesnt look like when Roxas summoned the kingdom key. Analyze it closer..