well obiwan thought he was a match for the emperor. plus, yoda never saw the emperor fight, so how does he know his strength? that is why i believe what i believe. because yoda's statement cant really be taken at face value given the circumstances. and about AOTC, that fight is invalid for comparing character strengths. in regards to anakin and obiwan. obiwan was held on geonosis in captive for a day, likley without nourishment. then fought for hours in the geonosis arena. he was hardly at full strength, same goes for anakin. at the same time a fresh yoda could not defeat dooku. dooku who was not at full strength after fighting skywalker and kenobi, although he didnt seem to put that much effort in defeating them. while in episode 3 anakin beats dooku fairly quickly.