Can I make a suggestion, on assault on the control room, make the final push an actual assult.

like when you start crossing the bridge hornet comes in and blows up the banshee players normally take, followed by two pelicans moving in landing on the tower its self. as you go inside you hear coms from the combat outside.

upon getting to the lower you are greeted by marines, and a rocket hog. Pushing up the tower plays like normal but now there are dead marines all through out it.

one you get to the top the golden elite is outside having just killed the last of the breaching party. upon his death two more pelicans will come in and drop off marines.

this will give you some fire support when opening the door. To retain challange 2 more gold brutes should be added to the force once the door opens.

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on "two betrayals" the player will be greeted by marines instead of covenant, Cortana will call an evac for them and the first part has you holding out until the pelicans arrive once they do, you get the pulse generater objective and a hornet to get there.