That would make sense, and I don't really see any other explanation, unless we add a different spin but then it turns purely speculative. It could be for instance the preparation of some sort of combo, like you need a maximum number of people carrying the spike protein that will interact with the next batch of pathogens you'll release in the future just like the joker did in the first batman by tim burton. But then again it's entirely speculative, it's the gate open to all windows