I did not see a single reason other than his armor. Like above he would just pop invincibility and mow chief down. I guarantee you 9/10 doomguy dies in hell, but it's always that 1/10 time that he wins. ALWAYS
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How about the fact that he is responsible for the deaths of 50,000,000 enemies, excluding about 80% of the missions he was on as those kill counts are hard to track.
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If that were true than there must be 24 quintillion Covenant soldiers. I also guarantee 90% of those kills are grunts. So easy to kill a caveman can do it.
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This isn't across all players in a campaign, this is with covenant, flood, and Prometheans. Most of the missions he's on have been excluded because they're hard to track the kills of. This includes the destruction of covenant fleets, activation of Installation 04B, and many other instances.