I think it would be an awesome twist if Sidious was kept secret until Episode II. Audiences watch Episode I and assume Dooku is the big bad and Maul his apprentice. Go through Episode II knowing about Dooku and suspecting him to make the Empire. And then at the end, we reveal Dooku is just another pawn in a far greater conspiracy.

I know it doesn’t really matter now: everyone knows Sidious is behind it all now, but if we were designing this edit for someone who’s never seen the PT I think this would be a much better way to go about it.