I think there are just as many examples of world-class smart people on the other end of the outgoing/charismatic curve: Von Neumann, Feynman, Bohr, Russell, Hilbert off the top of my head.
Or is it possible that we know about those world-class smart people because they're outgoing/charismatic? ie. perhaps listing off names of smart people we can think of who are/aren't outgoing/charismatic is maybe not the best way of determining any statistical inference whatsoever.