I'm not sure if Sidious is top in IQ. I mean, sure, he's a brilliant political genius, but he's at top because he's best at playing people, which doesn't necessarily correspond to highest IQ.
Plagueis seems more likely to me.
Originally posted by ILS
If mechanics and are engineering are to be considered Maul should probably be considered. Making functioning legs out of junk metal and attaching them in seconds after being cut in half.
That *is* good kludge work...