The about-face on the lab leak theory felt very orchestrated to me. In particular the public finger pointing linking the scientists decrying the theory and their involvement in gain of function research and those that funded them also promoting a zoonotic cause. There is a juicy rumour floating around recently that a high level Chinese intelligence officer has defected. I can't find any reliable sources talking about it, but haven't looked very hard either. https://redstate.com/jenvanlaar/2021/06/17/breaking-chinese-defector-confirmed-as-top-counterintelligence-official-n398374 https://www.thedailybeast.com/rumors-of-us-secretly-harboring-top-china-official-dong-jingwei-swirl This move is going to piss China off so badly, that my guess is that the administration already has the evidence they need to make a reasonably certain conclusion.