DECARA scope that's 'smaller' still tries to cover every use case, just with less polish on each. A scope that's minimal picks the one workflow that proves the idea and builds only that, end to end, at full quality.
The way to find that one workflow is to ask what would make a real user come back tomorrow — not what would make a demo look complete. Those are usually different lists, and the demo list is the one that blows the timeline.
Everything else — the settings page, the admin dashboard, the edge cases that affect 2% of users — waits. Not because it doesn't matter, but because you don't yet know if it matters, and six weeks is enough time to find out.