I've suggested that the lab gets bats from somewhere else, using "bat catchers" I surmise. Those bat catchers could have been infected by catching said bats andt hen wondered over to the market later. It's a possible scenario. And would explain why the CCP has been so tight about information on this.
It would be the fault of the Wuhan lab, but not due to a release. The other unresolved issue remains whether this virus is entirely zoonotic or not.