I really like this theory also. But I always inclined toward Itachi giving Naruto the magical necklace, I beleived this because if Itachi had the other two mystical items in his collections it wouldn't be surprising if he had the third. The royal jewel stands for benevolence (Benevolence means much good for others. As such, it is a form of love. But some theologians, such as Thomas Jay Oord, have argued that love involves both giving and receiving. A loving person must, then, be both benevolent and open to receiving good gifts from others.) Which leads me to beleive Naruto is going to need to open uo to his freinds for help, because he mainly shuts himself off from others so they don't have to handle the burden