I've watched the ARG analysis video RGN made about a few months ago and for months I have been wondering how The Silent Observer (Schruharsenal) got a picture of Hans Altmann despite him being a part of Hans' DID (Dissociative Identity Disorder). And so, after months of rewatching the video, I might have a rough idea on how he got this photo. For this theory I will refer to the two personalities as schruharsenal (Silent Observer) and lauscherhans (Main Character type guy). I will also discuss some other things along with this theory.
PART 1: The Silent Observer has more knowledge than Lauscherhans
So, by this time we all know that Hans Altmann suffers from Acute Dissociative Identity Disorder or DID for short. But this doesn't change the fact that the two personalities are equal in terms of IQ. They both specialize in cryptography and literature. But from watching the video, I can infer that schruharsenal has more knowledge than lauscherhans, here are some proofs:
-Seems to know more about what happened before they got into "his mansion".
-lauscherhan's explanation of the past seems murky and incomplete.
Therefore, I conclude that schruharsenal must've had MOST of Hans' memories before he got the disorder and therefore, had more knowledge than lauscherhans. Since DID supposedly makes gaps in memories and gives hallucinations to the patient, this doesn't seem to apply to memories before the patient got this disorder (idk if this is proven but by observing schruharsenal we can infer this).
PART 2: How He Actually Got The Photo
I do not know if someone actually suggested this before but I'll say it anyways. Since I said in the last part that schruharsenal might have more knowledge regarding the past, he might've known about the surveillance cameras all around the so called "mansion" Versic put around when they were placed there. So, after lauscherhans descended from the basement, schruharsenal went to the cameras and retrieved the photo/s.