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I think this is mostly asking how many angels can dance on the head of a pin ...

What definitive evidence can we provide of an animal host now? What definitive evidence can we provide of a lab leak? Of a deliberate release?

I don't think we can provide definitive evidence for any of the options, that proponents of another theory, even the reasonable ones, will accept, so ... I believe it is exactly 3 angels.

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There cannot be evidence of the first, but there can be evidence of the other two (supposing one of the latter options happened). The problem is that there cannot be evidence that those two didn't happen. So if the first option happened, we can never be sure of it; the only way of being sure of something is if one of the other options happened and it is revealed.

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