There are others with perfectly legitimate claims to being the greatest: The two "Sugar Rays," Leonard and Robinson; Joe Louis, Rocky Marciano, Jack Johnson, Henry Armstrong, Roberto Duran, Julio Caesar Chavez Sr., and even Floyd Mayweather. There are at least a dozen whose names can be easily mentioned in the same breath as Ali's as the greatest pound-for-pound fighters. Heck, Ali may not even have been the greatest heavyweight.
Larry Holmes dominated a way-past-his-prime Ali but, with the greatest left jab in heavyweight history, Holmes may well have dominated an in-his-prime Ali. Mike Tyson in his prime also would have given Ali fits.
All in all, They were all great fighters of their time. RIP
