In most ranking systems, the decisive point for determining rank is based on a combination of factors such as the number of wins, losses, draws, and the strength of opponents faced. While it's possible that killing an opponent quicker could have an impact on your ranking, it's not necessarily the only determining factor. It's important to keep in mind that each ranking system may have its own specific rules and criteria, so it's best to refer to the specific rules and guidelines of the system you're participating in to better understand how your ranking is determined.