Pulling Saudi away from China, what is the hidden force?

Recently, rumors have been circulating on the Chinese internet, stirring up speculation about the ‘Saudi Crown Prince Assassination.’ It seems to be sending a message that Saudi Arabia is not a safe destination for Chinese investment. Around the same time, Western media is heavily promoting the idea of the US striking a security deal with Saudi Arabia, potentially pulling them away from China and back into the embrace of the US. Is this all just a coincidence?