[AlexM]

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I doubt Kensei lives hundreds of years to kill Hiro's dad. That plot is too weird and makes him too powerful, plus it seems out of character. Plus Ando has Kensei's sword.

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Weird is good. How is regeneration at even that extreme level (which is still less than Wolverine in X-Men) comparable to Peter, Hiro or Sylar's powers?????? As for the sword, what does that matter? Maybe he decided after a couple hundred years he didn't want it anymore and gave it away or sold it. Hell, maybe it was stolen 200 years ago. Also, it could be as simple as changing his identify due to the whole not aging thing. Carrying around your trademark sword isn't a good way to change identities.