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Board Thread:Series general discussion/@comment-28601337-20170111002710/@comment-25196218-20170111145905
The way I see it is that the Animus made a visual representation of Callum's mind (sort of like a dream or visual thought). Callum was 'ready' to become an Assassin and visualised his own initiation, together with his mom and dad (and some other assassins just to for the sake of having assassins around). He was reliving no memory, it was not some kind of nexus, it was all just a 'dream' invented by Callum.