He won't be. Every numbered entry to the series has a new time period.
Altair is repeatedly mentioned to be Ezio's great-great-grandfather. Plus subject 16 is also a descendant of Ezio. Just sayin'.Molohath said:You are all talking about how Altair's bloodline ended up in these places, but have any of you considered it may have nothing to do with bloodline.
Notice the fact that Altair, Ezio and Desmond all look identical, and all have the same scar on the lip. Also notice that Ezio was referred to as Desmond at the end of AC II.
Perhaps Altair/Ezio/Desmond is an anomaly similar to Neo in The Matrix, or perhaps he is always created to be in existence, only one at any given time, but to be there, watching over the Templars without knowledge of his purpose.