The fun thing about Google, though, is that Page and Brin still have majority stockholder voting power because even though they own less than 15% of the shares,

The fun thing about Google, though, is that Page and Brin still have majority stockholder voting power because even though they own less than 15% of the shares, they also own pretty much all the super-vote stocks. The shareholders can't vote out the CEO (or really, vote for anything to pass) unless Brin and Page are on board (or don't care). So really, the only threat a Google CEO has is from the board. While your argument might work when it comes to regular publicly traded companies, Google is nothing like a regular company. As a tech giant LLC, the general public can buy shares, but those shares buy them nothing except for a cut of the profits.