alright, guancha people on this. Sounds like Mexico & Turkey are both interested. Some of these countries may say they are not interested when it looks like they are not getting accepted (like Argentina, before they actually got accepted). I would imagine Mexico makes a lot of sense.
We have to think about what BRICS is. From China's side, it is a lot about de-risking. How can China develop market it can sell stuff as the West continues its public pronouncement to de-risk. Guancha folks really talked about importance of South Africa. Clearly, a big part of Xi's visit is about South Africa itself. China would like to have similar relationship with SA it does with Russia where Chinese companies dominate the local market. Most recently, it's with how to end SA's energy crisis
Now, China can help other African countries.
The entire goal of including more African countries are very much in line with China's historical moves to prioritize its relationship with Africa. That has certainly worked out very well for China.