My $.02 is that "Adam" was never really Takezo Kensai. Bob told Nathan that "Adam" had been imprisoned somewhere but that a week or two ago, he escaped. Maybe "Adam's" imprisonment in ancient Japan had to do with Hiro's father's power and his death.
And since "Adam" seems to be able to heal like Claire, I would think that he is also a potential cure for the "Shanti Virus."
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AGD
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