People who think "you cannot reincarnate into the past" are moronic fools who have no idea how quantum physics actually work! If time is a human conception, then why the hell would it be "required" to always reincarnate foward in time? Simple answer; it doesn't. There is no time in the spiritual plane, so no limit exists nor is there a wait for souls to reincarnate, that's ridiculous!
I'm glad more people are on board with "yes, you can reincarnate anywhere in time" because being limited to only the future would make it really stupid and pointless. Besides, I don't want to be reborn into a point in time where technology does EVERYTHING for humans. We don't need that "Jetsons" principle to operate on mankind, as it would just make life bland and pointless. Also, it's been scientifically proven that machines (A.I.) will eventually overtake mankind and that's bad news!