Mazer tells Ender that humans have the advantage of having a person who is capable of making decisions inside their warships. He's saying that the Buggers do not have this advantage.
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Answered by Aslan
I'm not a part of the Buggers but I know they think collectively rather than individually. This has both good and bad tactical traits. I think, had the humans not used Ender, the Buggers would have won the battle.