They look absolutely amazing. Theres all the main Battle ones and there’s also a separate one which looks like it’s meant to be a boss battle with a Guardian.
My favourite one is probably where all the Knights just explode in the middle of the Banished army.
It’s a shame they cut them. The game could really have used a third faction and the games epilogue really leant towards it. Nothing against Awakening the Nightmare but it’s very much a side story. If the Flood get out it’s not going to be outside the main game. Plus it would have been a good place to put a lot of post Halo 5 lore concerning state of the galaxy.