I think if someone rejects the man-made theory, one should also reject the lab leak theory. There are ~1200 nucleotide difference between the most close bat coronavirus RaTG13 (corrected: collected in Wuhan Institute of Virology in 2013) and SARS-CoV-2. The average mutation rate of SARS-CoV-2 is 2 nucleotide per month (24 per year). If there were no man-directed experiments conducted on the bat coronavirus in the lab, it would not change that much in 6 years; if there were no such accelerated evolved coronavirus present in the lab, there was nothing to leak.
Several cases in Dec had no link to Wuhan's Huanan seafood market. The seafood market is just a place where cluster infections took place. The infected % is not comparable to Diamond Princess ship or nursing homes. Chinese first thought the wet market was a big deal because of the experience of SARS.
https://www.bfmtv.com/sante/coronav...-19-en-france-des-le-27-decembre-1906757.html
French doctor in Bobigny said they did COVID-19 PCR on the samples of pneumonia patients admitted in the hospital in Dec and Jan and found one patient admitted on Dec 27 tested positive. No travel history. You don't think it special then you miss it.
When Washington and California labs started to do COVID-19 PCR on samples in past influenza surveillance system to investigate how early the community spreading occurred, they never tested samples from 2019 when there was a unusually high peak of influenza-like illness peak (not necessarily influenza positive). When I discussed this with some friends, others always say if no positive was found in first weeks in Jan, there is no need to check 2019 weeks. Well, it is scientifically possible that someone got COVID earlier but just recovered without infecting a lot (all those infected recovered without knowing or died). Right now, there is no lab evidence that all COVID strains transmit the same. There are several reports of superspreaders, like the guy named Mattia in North Italy, the Jewish lawyer in NYC, etc. It is possible that certain mutations occurred when the viruses were replicated on these superspreaders and the mutated strains they carried were more contagious.
Edited: About rechecking influenza surveillance system, Wuhan rechecked from mid Oct 2019 and found no positive until first week of Jan. It indicated that community spreading occurred before the first week of Jan. French made a good point that the samples of pneumonia patients should be rechecked too to identify the earliest cases.