No bats or pangolins sold in Wuhan wet markets according to Wildlife Conservation Research Unit, a study by Oxford University found. The study was from May of 2017 through November of 2019 when the first strains Covid-19 may have struck in Wuhan.
This once touted basis for the Covid-19 virus would be eliminated should this be true. (We never know what is true or false news).
That leaves the Wuhan Institute of Virology leak the remaining theory.