I don't like to battle for an opinion, not here on WS and not in real life. Sometimes I have an opinion because of some reasons, and sometimes I'm thinking, I am right and condemned to wait.
I'm not particularly gifted with logical thinking, so I have to ask: where is the logic behind the idea, that it MUST be definitely a single burglar, who suddenly kills a person, although masked beyond recognition? Why is he fleeing within seconds, although he acc. to your theory doesn't know, that a whole crew of Missy's clients will show up?