Quote Originally Posted by Anonymoose View Post
If my theory is correct, those who have fought primals retain memories of their power and abilities.
I love your explanation, but have to object to this.

If you follow the events of the Summoner quest line chronologically with the events of the main story line (ie. you were to look at them as if you were doing them at the same time), then this theory falls apart as soon as you hit Lv45 and proceed to unlock the Garuda-Egi.

Story-Mode Garuda (which you do as early as Lv44) does not summon Suparna and Chirada, but the Garuda-Egi that you fight does. If your theory were correct, Garuda-Egi in that fight should not have been able to summon Egi versions of Suparna and Chirada, because we would have had no idea such a thing was possible until fighting her Hard Mode variant at Lv50.