1. There is no viral backbone anyone knows of which would have been used in this research 2. There is no spike protein anyone knows of which would have been used in this research 3. The PRRAR furin cleavage site is not one humans would have tried it is unlike any other known furin cleavage sites in coronaviruses 4. There are now many known related sarbecoviruses which have been found with furin cleavage sites 5. Furi…
The more important part here is an investigation on the origins of the virus is more about beurecracy than the actual science so unless you can conclusively prove that this virus could have never been engineered by a human you should stop bringing “improbability” of all of these processes as why we should trust these scientists.