If Sabo was still alive you'd think Oda would had done the flash-back arc BEFORE the war.. obviously he wasn't thought up on the spot (Else he wouldn't have been a main character in the arc he was shown) so it makes no sense for him to still be alive, he was made up to die and thus give Luffy the courage to go on after Ace's death.
Not trying to get back into this thread ( since FenixMarco "knows" Sabo is alive

) however, I don't understand why a number of people thinks its likely that he's still alive,
and clearly its MOST likely that Sabo died on that ship.
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