I am an artist, and my medium is death. I'm about to create my masterpiece :s
Fan of the Rasengan Doujutsu theory, even though it's dead. Although, he does have the special Uzumaki clan blood.
Well, its a interesting theory, but I dont think it will be a blade that he can use, its probably to combat sasuke invading his mind through the sharingan and its would be dangerous because it could destroy sasuke's mind or something gay like that
I think this is a good theory, however, I'm also thinking about a connection between the crow and Yatagarasu, the pet black three-legged crow of Amaterasu (the sun goddess of Japan, sister to Tsukuyomi and Susano'o). Yatagarasu is actually MUCH closer to Itachi's theme (as is obvious by the names) than Kogarasu is, but I have no idea what the bird is supposed to do (aside from calming dead spirits of people), so I'll still have to do more research.
Apparently the gift can do some serious damage. He did say he hoped Naruto didn't have to use it. It is probably something that will automatically activates. Like the auto activating of the Amaterasu when Madara does something stupid.