Posted by: Plasma Prestige
They aren't even on the cover, and normally if the book was about something or someone they or something related to them would be on the cover at the least.
I wouldn't use the cover art to make assumptions, because the interpretation of the cover can be quite different. For example, you could see possibly two major characters on the front, or the cover could be a largely symbolic representation of humanity and the Sangheili's relationship post-war.
I didn't think that art cover was final, I thought it was just there for the sake of being there, when you go online to order it, there's no picture of the actual book, and I presumed that the already release art piece was basically just one of the art pics that was drawn for it.
Hell I could draw the art piece that I linked. Even though I'm a very good artist, I personally think I could draw a better front cover, and the picture was infact drawn by an artist at Bungie, which surprised me to be honest.