Yeah, in terms of influence I think 2pac is absolutely more influential than BIG. Or Jay. And I don't actually think Nas is as influential an artist as he is creator of one infinitely influential album. So that's why he's not in the top 10. Thinking purely about how much influential material did the artists release, and how big of an impact did it make. You can still catch shout outs to Tribe in modern rap. They're the rap Beatles. RIP Phife. And Pac's the rap Nirvana. And Kanye is (sorry) but the rap .... ok let's just say Prince so you don't have to leave the board.
