While I definitely agree with you, my question is this:
The mob was seemingly destroyed in The Dark Knight, predominantly by The Joker (ironically). This has supposedly begun the path for the "freaks" to become the new villains in the city: no more organized crime, much more disorganized (and in turn, arguably much more devastating) crime.
Now, since the mob is all but gone, what would Alberto's role be? Bringing in another mob boss when they've all but been destroyed/incarcerated seems slightly asinine. On top of that, I'm not too keen on the idea of bringing in the son of a villain from Batman Begins when he was nowhere to be seen in said film, as that would seem pretty forced to me (see Jeph Loeb's Hush comics)... And I don't see how Nolan would want to do that. That said, this is the only actual series of films he's ever done, so we, to date, have no set patterns from Nolan to count on.
With this in mind, my mind falls to Jean-Paul Valley/Azrael (as said before) as the most logical and beneficial choice, especially since he can be a villain AND hero at the same time. The only benefit I see to bringing in Alberto is if they play off of the When in Rome story arc, and connect Selina and Alberto somehow, and make Carmine a major part of the story somehow (which, again, would seem forced, and I don't understand why a lot of the fanbase is up for this considering the lack of desire to see the Ra's al Ghul and the League of Shadows storyline's return).
The only other idea I could have, is actually Hush- just a new, revamped version (in other words, there wasn't a mysterious third friend of Rachel's and Bruce's in their childhoods that was never mentioned until now, but more of a mixture between Black Mask/Hush). That said, I'd much prefer Valley.