I believe he is alive... Why? heres why..
1.He took name Makaveli after reading machiavelis book in the prison. If he wouldn't fake dead taking that name would be meaningless. And every1 talking about comeback. If he does I think he do that at 2014 cause that name. Machiavelli and Makaveli "Died" at age 25 machiavelli returned at age 43, let's see what tupac does.
2.Lack of pictures and all that stuff when he was dead and all. Autopsy is fake, it took from one of his music video and it's missing tattoo what he took after doing that music video.
3.He knew when he gonna die. He told in document that he predicts he's own dead but he doesn't tell where. That place is music video of I wonder If heaven got ghetto. He also didn't wanted to go vegas, when he go vegas he once told "Dead man walking"...
4. God bless the dead... There he say "Rest in peace to my motha*BLEEP*a Biggie Smalls" "Don't worry if you see God first", but Biggie Smalls died after tupac... so maybe tupac knew that he will not really die long long time.
5.Eminems freestyle "Hiphop haven't been same since tupac moved cuba"
6. Heartz of men "I died and came back".
7. He have seen in cuban rapper music video and possibly in young jeezys video.
8.Theres also Fake pic of tupac in suges car. So theres not kinda real pics from that night.
9. Life insurance
10. Theres some reverse messages in his song.
11. On biggiest messages in his lyrics are in Realest Killaz where that Makaveli rock breaks and in and in chorus 50 cent said many times that "till Makaveli returns its all eyes on me"

Theres biggest things and why i really believe that... I don't believe any of those number 7 theories. But that Makaveli thing is pretty huge thing and some of those lyrics, specially in other rappers said those like 50 cent and eminem. But that Makaveli thing, that's only reason what I see to take that name, or why did he took that name then?