Captain Braxton returns through the rift in “Future's End” having never experienced the catastrophic destruction of the solar system time line, which has been altered. Then in season 5, "Relativity" his far future self plants a device to destroy Voyager to prevent himself from going back to the timeline which no longer exists. Where does the Braxton come from and how was the causality loop even broken in “Future's End”?
BRAXTON: Yes. No. Yes. That's the paradox, my dear. A leads to B leads to C leads to A. Juvenile minds. Oh, how can I make you understand, huh? A. There's an explosion in the twenty ninth century. Debris from Voyager's hull is found in evidence. I go back in time to destroy you. B. You try to stop me, disabling my weapon which causes me to crash-land back here in the twentieth century. C. Someone in this century steals my timeship and launches it. They go into the future and once there they make one critical mistake which causes a terrible explosion that takes us all the way back to A. There's an explosion in the twenty ninth century. The cycle of causality is complete.
So there are two questions. How does Voyager break the causality loop and not repeat the same events that resulted in Voyager's remains being found in the wreckage, and where does crazy future Braxton come from in "Relativity"? If he came from the 20th century homeless man, then how does he get off earth?