A quick summary of https://www.youtube.com/watch?v=av2Hax3Bg1U
(1) The area where the Nyctereutes spec. (german: Marderhund, I have no idea how it is called in english) where kept, there where a lot of DNA of Nyctereutes and a lot of nucleinacid of SARS II.
(2) From the beginning there a two lines of the corona viruses laboratory-confirmed. From the evolutionary speed of virus mutation it is nearly certain that the separation had to be taken place months before. About 8 times a corona-variation had been aquired by man. From this infection chains 2 virus-types had survived to be confirmed in Wuhan. A person who works in the laboratory would have been working with a clonal virus that is not mutated in that way.
(3) The market is the center of all infections even if you take out everybody that is known to be at the market, not the laboratory.
(4) For the animals at the market a analysis showed that they had been ill/infected (not specifically corona)
These are all separate published aspects that points to the same thing.
The part starts at 2 hours 23 minutes 30 seconds - you have to use auto-translated subtitles which are unfortunately not very good (german language)
[1] https://en.wikipedia.org/wiki/Christian_Drosten
edit: grammar