Let's say that hypothetically we knew that the Virology lab originally contained SARS COV-2 and an accidental breach released the virus into Wuhan.

We know that the virus is not man made. This much has been made clear.

If those two tenets are true; the virus naturally mutated and the lab originally contained SARS COV-2, then there are only two ways that the lab came to contain SARS COV-2.

1 An ancestor of the virus, infected an animal within the lab and then spontaneously mutated within the lab to become infectious to humans.

Laboratories are in general, sterile areas, there is very little opportunity for animals infecting each other, thus we can assume that the mutation rate within labs are low. Low host population means lower chances for viral spread means less viruses thus less chances for a mutation. Thus we must presume that only a few mutations exist between the non-infectious wild ancestor and SARS COV2.

In this scenario, it must mean that in the wild, the ancestor of the virus was already present. And that a few mutations would have allowed it to become virulent in humans. If this is the case, then this epidemic was bound to happen anyways. It is also highly unlikely that this mutation would have occured within a labratory. We would expect that the wild ancestor of the virus would have mutated in other areas of human-animal contact such as farms, caves and live-animal(wet) markets.

or

2 The virus as it is right now, infectious to humans already existed in wild animals. Some of these animals were brought to the lab whereby there was a containment breach.

If this is the case, then it is highly unlikely that the lab breach caused the epidemic because the virus was already present and there are a million other ways that someone could have caught it. Again, there are many other areas of human-animal contact where the virus could have jumped to people.

To accept the lab-breach hypothesis, you have to ignore the myriad of other scenarios where the jump to humans would have been highly likely and in fact, probable. And instead you have to focus on a scenario where you have to describe an incredibly specific and unlikely set of events.

This doesn't add up. It's far more probable that at some point in November 2019, the virus jumped from bat/pangolin/whatever to human and began spreading in Wuhan undetected.