I am certain that this subject has been discussed multiple times at this point, but I shall still make my own thread about it.

Now that it is known that the masked man who fought against Minato sixteen years ago was indeed Obito, I wonder: how did Minato not recognize Obito? Each person's chakra is unique, just as their DNA or fingerprints are unique, so surely, a ninja as skilled as Minato would recognize the chakra of his own student, unless Obito was somehow concealing his chakra or disguising it to feel like that of another person? What does everyone else say about that?