
There was a blog out there about this, but was recently closed. I heard some nice theories in there and have included them into my theory as to why Dooku didnt say anything so thank you to all who responded to that blog as well as this one. Here goes:
#1 Dooku is in utter shock and cant believe that 1. he lost, 2. Palpatine has betrayed him, and 3. Anakin is thinking about killing him. This is too shocking for him to think clear and fast enough.
#2 If he tells Anakin, he will not beleive him. Anakin knows Dooku is a sith lord. As Yoda once said "lies, deciet, creating mistrust are his ways now. If Dooku made such a crazy proposal, Anakin would not believe him. It could make the situation worse as well. (this is probably the main reason he didnt say anything, but the other reasons contribute to it as well)
#3 Maybe Dooku is doing it for the better of the Sith. Maybe he feels honor in loosing and being killed. He sees that he lost fairly and that Anakin will become a great sith. (still... i doubt this had anything to do with it. just a possibility though).
#4 Dooku doesnt think Anakin will do it. First of all, Anakin doesnt seem like he wants to do it. He even says he shouldnt its not the Jedi way. Right before this Dooku seems to be hesitant on something, as if he is about to speak, but then Anakin says this and he shuts up (maybe he and Palpatine can both make it out together). Dooku sighs as if thinking Anakin wont do it after saying he shouldnt and that its not the jedi way. then Palpatine with his evil (Ian is amazing at this) "DO IT!" Dooku now senses Anakins change of mind and gets scared. He raises an eyebrow and looks like he is about to plead or tell Anakin something, but Anakin kills him b4 he can say anything.
Now as for #4 i'm not saying Dooku was going to say anything, but he could have. Bottom line is that Dooku didnt think Anakin would go through with it and that Anakin would not believe him.
Comments are well-appreciated as are theories. My e-mail is
littleeagle2032@aol.com in case you wish to e-mail me or IM me about this. Thank you for reading and commenting!
May the force be with you.