Why is he a random jackass? He's not a character in the story or anything. His purpose in the scene is to tell Ezio to get some rest to which Ezio then comes to the realization that his time has come. Unless you want to count the letter he wrote as his realization
So I'm looking at these stone pillar gates on Animus Island that lead you to the Desmond sequences and notice there are seven, two of which are broken.
Now, unless they are unlocked later in the game (I'm up to sequence 6), which I doubt since there are no corresponding trophies for it, I kinda get the feeling they are reserved for future DLC.
In the post-game, after the credits, those two broken gates appear to be repaired. Though you aren't give any indication of how many animus parcels that are needed to unlock them, if its even possible.
Personally I'm hoping that they aren't DLC because gameplay-wise these were the weakest parts of the game.
The final two DNA sequences were balls to the wall awesome though. More than made up for it.