Since he never returned home, he is going to jump for eternity. Therefore, he is going to replace everyone in the project's timeframe. There is a flaw in this reasoning, though. The only person he isn't going to replace is actually himself. * Wasn't there an episode where Sam leapt into his teenaged self and attempted to prevent his sister's abusive marriage and his brother's death in Vietnam? * He'll never leap into himself in his own time.