The best should the fight the best. It would be tragic for them not to, same as Pacquiao and Mayweather. Silva would probably lose, but it'll be a shame when it never happens. Just like how we never saw Fedor in his prime in the UFC, it would have been amazing to see him squaring off against Couture or Mir for the belt. So much politics in what should be a simple concept, the best fight the best.