>< grinning > yes, we could argue over items like these ad infinitum. :-) Nevertheless, though assuredly powerful, I don't think Darth Sideous was as powerful as you view him, though he certainly presented that air. Mace Wendu had him and he was toast if Anakin had not intervened. :-) But, after all, it is only a movie (series). Things could have been done any number of ways at the whim of the writers/directors and as much as I like SW, there are inconsistencies that none of us really care about simply because we love the story, characters, etc. :-)
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I like to think that Sideous allowed himself to almost be killed my Mace because he "knew" that Anakin would intervene and that would be Anakin's last step into the dark side. The fight between Mace and Sideous seemed to easy for Mace. It is said that the dark side is more powerful, so from that I conclude that Sideous is more powerful than Yoda.