Any ideas? I thought it was all about the elites in Reach and that the brutes didn't come until Halo 2.
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The real world reason why there are Brutes in Reach is because they are another enemy to fight. Halo 3 and ODST had only Brutes as the main enemy. Why just throw them out in Reach? Halo 2 you were fighting Brutes, Elites, and the Flood, along with the rest of the Covenant. That made it fun, why not add Brutes to Reach and add even more action? Right there's your answer.