DISCO's main cast wasn't the usual Trek line up. The lead in Discovery was a disgraced officer turned consultant. The other mains were a cadet, a Scientist, the Captain and the First Officer.That's kind of odd - and very similar to Reno in DSC, being the chief engineer, yet more of a periodically recurring character, as opposed to being a part of the senior staff. In all other shows prior to DSC, the engineer was always considered a part of the main crew.
I don't get that shift.