Then again, if you actually go back into the trailer, the torso armor looked a lot bulkier the shoulder armor looked smaller, and the helmet had some weird upper plate by the mouth unlike the drawing. So I do think the drawing for ODST is not too exact.
The same thing with the Recruit Prime skin armor though. If you put on the same armor with the same colors, they look way different, the prime skin drawing actually looked cool unlike the in-game skin.
But still, you are right in a sense, we barley saw it at a good enough angle, we'll see it better in the future.