Thanks.
Interesting stuff. Your last sentence that there were those who may have not spread to others reinforces the super spreader theory held by some.
I think the super spreader theory is pretty well documented and not disputed, what's yet to be conclusive is the cause. However, it is definitely well established that people only transmit virus for a very limited time, be it 12h or 5 days. Remember the White House? Everybody tested daily, but every day new cases were found from the original cluster.
While it's easy to spot the holes in the net, global precautionary methods are phenomenal. In previous respiratory epidemics 50m+ died. We are at 1-3m so far. Yes modern medicine saved some, but likely no more than a few mil. Science is incredible. Politics are horrendous.