Nobody stays on top forever and after he died neither did Pac,i think musically its safe to say AT LEAST he couldve had remained a gold selling artist.....Cube reemerged and got a platinum plaque with Laugh Now Cry Later....so no hes not human,thats what seperates the goats from the regulars

...they continue dropping relevant albums and or singles

...in the case of scarface he may not sell crazy but he continues to drop great material....so i dont neccesarily base longevity off of sales or being on "top" of the game.
And

at dmx knocking pac off...cmon Wacky,he wouldve come off like a straight clown and biter instead of Pacs "replacement" upon Pacs death.....Pacs death opened up the lane for Ja Rule and DMX to be embraced in the first place....so only way he couldve knocked Pac off is by a head to head....you think west coast was gon ride with dmx over Pac?he wouldve had to fall off at unrealistic levels for that to happen.
Also
@mobbinfms you cant compare Jay being succesful to Pac bein succesful and goin 5plat

....For one we would have to assume Pac would start acting like a safe nikka like most artist when they come up....can you imagine Pac acting like a safe nikka and shutting up

?
Also hiphop loves the underdog,should we assume Pac would switch up and stop representing for the underdog

? if he decided to go the 50cent route and stop representing the underdog and merley became a "bully" it may have come back to bite em.
main point theres more than one way to have longevity,im confident Pac couldve remained that on sum level....and even if he didnt we would still be talking about him and his music today....because not to many things more exciting than the fukkery Pac bougght has happened since,and none of his peers have outclassed him with the catalogue....even if you only count non posthumus
All the goats can make arguments in these 3 categorys u want to split it up into imo.