i said that this doesn't clinch his guilt but does look bad. MS was criminal partner to someone who he knew had an illegal weapon. If you were in this situation but had no intention of physically harming anyone (or being a party to it), then this knowledge should concern you. Why would he as a criminal have an illegal weapon if there was no willingness or plan to use it? By continuing to plan and go on missions with this man, MS was exposing himself to possible violence. That's what we can say about the gun ownership alone.
Then add in all the rest of the evidence. So MS was very naive about the gun? Maybe, but he's naive about the gun and he researched incinerators and sent other suspicious texts and continued to initiate first contact with DM after the murder (making him look like a full partner) and wanting to meet Isho and googling ammo after the murder and developing selective amnesia and contradicting other witnesses and ... All those things strung together are very difficult to explain innocently IMO.
Ms did testify about the gun and said that "There were other reasons for having a gun". He was not questioned further on this by any attorney. I understood it to mean that he claimed to own a gun for his own protection as he was heavy into illegal activities.
I also noticed that Isho was doing DM a favour by giving him the gun at cost and not making a penny. Wondering why a casual acquaintance would go out of his way to do such a favour. IMO DM & Isho were partners in a much bigger scale then anybody has testified to