I don't know about you guys, but this really seems to be the most convincing theory so far! It really answers the questions that have puzzled experts for years. "Jack" had to have been a man amongst the crowd, a man we'd least expect. I also wonder if he perhaps knew the police route and schedule, knowing what he could get away with and at what times (the reason he told police there would be an officer at the body of Polly Nichols, though there hadn't been one there when he left her). Check this amazing episode of Missing Evidence out and tell me what you think.