Dooku explained to Obi Wan that the Trade Federation turned to him after they were betrayed by Sidious. He continues by saying Sidious controls the Senate and is thus Palpatine. This implies he recieved the information from the TF. Why then do the other separatists such as Grievous not know this also. And why, after we are told that the war began as a result of the TF's ill-fated allegiance with Sidious, are they back serving him despite knowing the truth ? It is a very unclear subject to me.