i still can list a few that use the same sample the pac used:
Assassin - Kriminal Minded - Ambitionz Az A Ridah
Big Pun - Brave In The Heart - Enemies With Me (Original)
Black Moon - Buck Em Down - Late Night, Definition of a Thug Nigga Bone Thugs-N-Harmony - It's All Real - Runnin' (Original)
Eamon - I'd Rather Fuck With You - I'd Rather Be Your Nigga
Jim Jones Feat. Denise Weeks - My Diary - Pain
Kanye West Featuring Paul Wall & GLC - Drive Slow - Shorty Wanna Be A Thug
Nas Featuring Lauryn Hill - If I Ruled The World - Friends (Original)
Scarface - Now I Feel Ya - Runnin' (Original)
Will Smith - Just The Two Of Us - Po Nigga Blues (Original)
1st of all, your right. All Real doesn't sample Runnin at all. And then, all those songs besides Ambitionz Az A Ridah and Enemies With Me are already sampled from artist way before Pac.