"Yeah, he is. He's good." He was good to Sora and Sora never knew him to do anything really dishonest or wrong. At the time he might have thought him awful for the shit he pulled about his name, but the further away the situation got the easier it was to understand it was a terrible spiraling accident on Riku's part, and Sora just acted on his immediate hurt feelings without thinking.
Sora tried to section off a part of the board to make it impossible for her to invade that area.