Pangolins were an early suspect, but Alina Chan discovered that the multiple pangolin papers were all from the same batch of smuggled pangolins. This makes it much more likely that the pangolins were infected by something else, in the same way that housecats get infected by their human owners.
Because of this, Nature has placed an editor's note on their pangolin paper:
> 11 November 2020 Editor's Note: Readers are alerted that concerns have been raised about the identity of the pangolin samples reported in this paper and their relationship to previously published pangolin samples. Appropriate editorial action will be taken once this matter is resolved.
No one is seriously proposing pangolins anymore, not even Daszak and the Chinese. The proximal host for MERS (camels) was identified in a little over a year, and for the original SARS (palm civets) in a little less. For SARS-CoV-2, despite the much greater effort, we're still waiting.
