Ok, but tell you what, actually that makes no sense.
Multi crew is not a small feature measured on the amount of development necessary to make it happen. What seems less risky to you:
Putting it into a comparatively small and safe project where the only real development risk is multi crew, everything else you've got well covered because your engineers have a lot of experience by now. The project development cycle time is easier to judge and you can start to generate revenue based on that new feature relatively soon.
Putting it into a large project with lots of other features that are at high risk of causing budget and time overruns, a long time span until the project will be able to generate revenue (that is potentially higher than the small project, but you'll also have burned a hole into your pocket funding all those new technologies).
If you stop to think about it from the angle of project management, apart from just thinking about what you want right now, there really is no question about why ED did what they did.