[AlexM]

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Hiro was Kensei(the stor version) from the past all along...that's pretty clear too.

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Not at all. They fixed it to make it that way so that things weren't changed, but him having been Kensei all along breaks all the rules for time travel they've set up in the show.

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How does it break the rules? This is the 2nd time Hiro went into the past, and it made sense both times and he did what already was done.

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Because they've made it clear that when people mess around with timelines things change. For Hiro to have "always" been Kensei, that would imply that it's all destined and nothing they do in time travel changes anything, but then all these future trips to post-apocalyptic worlds wouldn't be happening.

Also, when Hiro went back in time the first time with the waitress, he did change things, just not much. Firstly, he was not in the pictures until after he changed things. Secondly, she didn't recognize him when they met in the original version of the timeline which she obviously would have.

To me, it seems obvious that not only was Hiro not originally Kensei but that his tampering with history is exactly what has caused everything that's going on in the modern storyline.