Pico has very thankfully calmed down significantly, to the point where I doubt he has any kind of significant neurological problem.
He is incredibly curious & sweet, taking food from me and now he perches on his water bottle, watching me play my computer games and talking to my friends. He brings me incredible joy to watch and feed. As he was only ever meant to be temporary, I worried about the stress his previous family had on him, and the repercussions that could make him harder to adopt out. However now I feel like my issues are with separating from him, as he is such a sweet little thing.
Soon, I will be getting a detolf. It was for Neptr, though now I may just make the needed modifications to his cage & provide Pico with the space. I'm sure such a curious little thing would be delighted with a much needed home upgrade. We discussed how the grand size could be a bit scary for him, however I've seen his stress recover and now he is awfully brave for something so awfully small.