There just ain't no way around Pac's influence and impact on the world, period. He's even more celebrated around the world than America.
Nas is the greatest lyricist of all time in my opinion, Jay has crossed over into the corporate world and broken down barriers status wise, they will be remembered in hiphop and embraced forever for what they've done for the culture, but none of them are goin to be celebrated like this.
Pac is celebrated from an outside standpoint, at times not even from a rap point of view and thats what some mean when they say he was bigger than hiphop.