I think we're talking about different things here. The unproven strategy that I meant was the one where a longer period ellapses between first and second jabs

I think we're talking about different things here. The unproven strategy that I meant was the one where a longer period ellapses between first and second jabs than had ever been tested. This new data is the test and shows that we probably don't now need to be concerned about that as we did when the strategy was first decided on and implemented. The conservative approach would have been to ensure everyone got 2 jabs with the elapsed time between them the amount of time that had been tested until this data came in to show that a longer period would actually still work. I don't know what the advantage of more people with a single jab is. Does anyone? Are you less likely to die? Or we hope so but don't have the data yet - the other leg of this bet so to speak.