It is my feeling that something happened to PB while MJ was inside of the apt. It's tough to say if it was in the middle of the morning or later on after DB went to work. I say this due to his behavior and he was the only one who was reporting PB's activity for the day in question. He also mentions 1:30 quite often. This leads me to believe it was around that time frame that this situation hit it's highest of heights.
I'm trying to give DB the benefit of the doubt that, she trusted MJ enough to leave PB alone in the apt. DB may have believed what MJ was reporting (until) she returned home from work, is when she put 2n2 together that something was seriously wrong.
Once she discovered something was wrong, I'm certain she attempted to grill her boyfriend MJ is (why) she waited so long to call PB's mother. I think DB was trying to get answers from MJ and discovered his side of the story wasn't adding up.
DB and MJ, along with certain other individuals are keeping their FB/twitter sites etc..on lock down and are low keyed/tight lipped. It is my belief that due to how close MJ is with some of his family members, he had assistance in relocating PB. I think it's logical to focus on the last person who actually saw PB, then, move outward to other individuals. I think most people who went in and out of the apt were mainly family members and some close knit friends. 9 out of 10, one of MJ's family members (probably) showed interest in PB. Remember that, most of the guys loved to smoke and drink (which at times) can make a person's behavior bold.
Short air-time on NG