From the moment Asher realized he possessed an alter ego, his first thought was simple: 'How did that version of myself hide from the system?'
As far as he knew, the ego was definitely doing something that contradicted what the system was making him do. In fact, his whole theory was that he himself was the alter, and that other entity was the original. Since there were hidden memories he didn't know about, and the fact that he had ether but was denied its use, that only meant THAT version of himself was aware of the system coming into play and what the goddess would do. It was also trying to keep things in accordance with the game by maintaining Azalea as he was supposed to be—etherless.
So him not possessing memories of THAT version of himself was probably to keep the goddess and the system unaware of THAT version's existence, and...
