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Are you suggesting that there was something perhaps a little contrived about a young boy doing what countless experts had been unable to by deducing the identities of Batman and Robin? Perhaps you think it's a TAD unrealistic that he'd prove so perceptive that he is able to note and analyze Batman's erratic behavior following Jason's death, correctly identify the problem and then go onto suggest a viable solution? The fact that he's financially well off, earnest and oh-so polite and 'inoffensive' compared to his predecessor was just a coincidence, of course.
And there's nothing at all Mary Sueish about an uber capable ninja with a mysterious and tragic past who is almost immediately accepted into the Batfamily.