i like conspiracy theories too.
one problem though-
Suge knight was in the car with pac when he got shot. Suge was hit in the head with a bullet too, but it grazed his head and didn't kill him. I remember him being interviewed, asked if he had anything to do with it. his reponse: "Oh yeah, I set it up. And I told them 'Go ahead and shoot me in the head to make it look real'.
Also - Dre left Suge, and all Suge did was go to his house and make demands, and he got his way. He let dre go, so I imagine he'd let pac go too -they were running biddies.