Quote Originally Posted by Kornman00 View Post
If you recall from Halo 2, they kept Jackels in the brig, so it's not just for humans, but for heretics as well.

If you recall Halo 1, 2, 3 and Halo Wars, they need humans to activate Halo or interface with anything Forerunner.
Halo 2 was the first time they used a human to try and activate a Halo.
Could be they didn't realise that humans were the only ones capable of freely activating the Halos plus they didn't have the index, In halo wars the prophet of regret only had small trouble activating the forerunner tech and only used a human then because it would be quicker.
Also in halo 2 the imperial elites and heretics had no double either side opening doors and what not on the gas station.