Yes, I agree the neighbors probably have more credibility. It's possible the neighbors are also mixed up with EN and/or the Meyers in unsavory ways, and if such relationships should come to light, I would give them less credibility. But at least for now, the neighbors get more credibility.
I could be mistaken, but what I got from the police report was that the friends told police EN had shown them his gun and his ammo. The police then showed them a 9mm, a .40, and a .45, and they pointed to the .45 and said "that's what he had." I did not get the impression that they identified by name 9mm, .40 and .45 and told police EN had .45 ammo.
Yeah, I don't buy that either. I can't picture EN telling his friends "So then I called a friend who owns a 4-door silver Audi to come pick me up."
But: That could be an artifact of the police having information that they haven't made public. I could see it going something like this:
Police: Did EN tell you who he called to come pick him up?
Friend: Yes, he said he called Badass Billy Jones.
Then the police check and learn that Badass Billy Jones owns a silver 4-door Audi. And they don't want Badass Billy's name out in public just yet, so they put in their report that the friends told them that EN called a friend who owns a 4-door Audi to pick him up.
That's speculation, of course, but I think it's plausible.
Good questions. I think there's probably a lot of physical evidence that the police haven't released yet. I hope guns, ammo, clothing, gunshot residue and the like are among that evidence.