Remember, most dark characters possessed the Gazing Eye in their keyblades, such as the chaos ripper and void gear. It could just be a reoccurring theme with the blades of darkness.With Souleater's relation to Way To The Dawn, and the fact that Souleater had the Gazing Eye in it, I really wonder if there may be more connection between the MoM/Riku. Especially when you consider that Riku was the actual chosen one.