I am hoping that a sufficiently definitive NTSB preliminary report is issued in 30 days or less. All the answers appear to be on the ground with no mysterious interactions between crew, aircraft, weather, et al that are the more frequent and overlapping set of conditions that lead to an investigation.
It seems like a fairly simple path as I previously outlined - design, manufacturing engineering, QA, QC, and the assemblers. Somehow this particular door happened as a result of a procedural disconnect.
The 1 year report can delve into the wider aspects of production controls and make recommendations for systemic improvements, but I at least want to see quite soon a report that Unnamed Person #1 did this and Unnamed Person #2 who was supposed to do that and didn't, so that the rest of aviation can then look to whatever those involved also touched and make sure it is OK.