>At this point, I came to the conclusion that the mage couldn't summon the template of Atreyan because the template was already here.
This wasn't what I intended to hint. Unlike the others, who need to be reawoken each cycle, Atreyan has completely eroded his own template. Later in that battle, when the last boss is summoned, the sorcerer realizes this and makes a comment along those lines.
Atreyan does have memories of the real world, but since he's the player's avatar, he's usually not the one bringing them up.