If your hypothesis is based on an exclusive, direct trace, how comes that you may still maintain it, if you have to allow for an unaccounted for and untraced sp

If your hypothesis is based on an exclusive, direct trace, how comes that you may still maintain it, if you have to allow for an unaccounted for and untraced span of time and spread, including an untraced roundtrip around the globe? How do you still establish the link between the lab and a location as specific as the wet market? This is a matter of basic science and hypothesis checking. If you propose a direct link, any unrelated, conflicting data point invalidates your hypothesis. (Incidentally, Lombardy, where most of the Italian samples came from, was also one of the regions hit hardest by the Alpha variant.) P.S.: Mind that the allegations are not about a loose probability, but about a very specific scenario, involving the lab and the outbreak at the wet market at a certain date.