Sure, I'm not saying that there is perfect overlap between the most susceptible and the most infecting individuals. But people who travel around a lot, meet a

Sure, I'm not saying that there is perfect overlap between the most susceptible and the most infecting individuals. But people who travel around a lot, meet a lot of different people, are simply more likely to encounter an infected person and get infected, and in turn are more likely to unknowingly infect everyone else they meet. The same mechanisms that make someone a "super spreader" is also what makes them more likely to get infected, and to get infected early in the pandemic. We know that for example medical personnel got infected in way higher numbers than the general population, for obvious reasons. But they're now also more immune than the general population, for the same obvious reasons. And as a result, intra-hospital spread decreases. Yes, it's two independent measures, but with very high correlation.