the stuff we don't know
whoever was WH patient 0 and whether they were a superspreader. The amount of virus they're spreading and how much contact the recipients had makes a huge difference in viral load and likely severity.
Most likely, DD is tested daily and many of the 200k victims would have been ok if they'd been tested daily and had immediate interventions.
Not complicated, but getting just enough so that it can be confused and obfuscated. Slowing down testing was the primary crime.