@Leica Oh, no, I'm very aware of the justification. But while it's justified, it still makes him less interesting right now than his awakened companions. After all, his not having the memories is ultimately the author's choice.
Take Kamika, for example. She started in the very same situation, but now she's struggling with her valkyrja memories while also taking part in the fight of Ragnarok, and her heart is divided between nostalgia for a divine family and friends she had forgotten, and her bonds with her Japanese life and current friends. Which becomes a sadistic choice between fighting and dying with the former group, or running away with the latter.
That is interesting. More interesting than Raise's hesitation, at least.