Callum should be experiecing memories of other ancestors...
The bleeding effect can throw people into other lifetimes. Other ancestors.
shareUnlikely, since only 16 was known to relieve the memories of various ancestors, while Desmond only relieved those of Altair's and Ezio's. Most likely he will only see Aguilar's memories during the Bleeding Effect, we will only see more of Callum's ancestors during the sequels.
The biggest problem with society is that it refuses to believe that different opinions do exist.