User blog comment:Aegis Runestone/Revelations and Brotherhood--Delay for AC3?/@comment-4705174-20120422175029/@comment-1888015-20120423192518

At the end of AC2, Ezio as barely an Assassin. While he chose to spare Rodrigo Borgia in the Vatican, he still came across as kind of an inexperienced and not fully mature person.

ACB showed Ezio to have gotten smarter and had learned what it meant to be a leader. While ACB didn't have as much of a solid story, it did do that part well.