I've always thought they planned to kidnap BW. Just the purchase of stun guns makes me believe that. Then add the texts and the videos, which most people would not consider to be "normal sexual banter between partners" and "normal viewing habits." I don't think it's a coincidence that they wanted to stop by the house while his mom was gone but while BW would be home alone. I think those opportunities are few and far between, since AG is ill and usually home, so they had to wait for just the right time.
I've said before that I believe they planned to kidnap her, take her back to their apartment, keep her for awhile for some very dark fantasies, then kill her. Nothing has changed my mind about that. I think they thought it would be easy peasy to kidnap her from the house: take her by surprise (simply by being in the house when she thought she was alone), stun her so she'd be unconscious, carry her outside (not in a suitcase!) and put her in the boot of the car. They didn't expect her to fight back (why they would think that, I have no idea, other than they overestimated the effectiveness of the stun gun). When they killed her too early to carry out the rest of their plan, their "fun" was gone and they panicked and realized they had to change their plan. I don't think they were prepared to change their plan. They had no backup. So things fell apart from there. Instead of getting rid of her body right away, they brought her back to the house (as in the original plan). They tried to dismember her with knives (as in the original plan), and discovered that wasn't going to work, so they had to buy a saw. Since they hadn't planned for her to die right away, they didn't have everything they needed to hide the crime (cleaning products, bags, cling wrap, etc.), so that meant they had to go shopping right away. All of these things they weren't prepared for dragged out the time they needed to hide their crime and her body, so everything took longer than they expected.
The police wanted to interview them, the police wanted to come to their house. Imagine the panic! What to do! What to do! So they get back in touch with SH's mom, leave their car at her house so police won't know they're home, do everything possible to avoid getting caught and put off the police coming to their home. But time caught up with them, they still had BW's body in their house and the police were insistent that they wanted to visit the next morning. NM calls friends, weaves his tall tale, and voila, body is gone and they figure the police will never figure out where the body is until they can move it within the next few days. But they get arrested and BW's body and the evidence is stashed in an acquaintance's shed. And we know the rest from there.
I think they spent weeks if not months to set up BW's disappearance to look like she ran away: created family friction, the post on FB, etc. This is one part of their plan that they continued after they killed her (telling AG and DG they heard her leave in a huff, posting on FB that she was missing and please keep an eye out for her, etc.). If they'd had the time they needed to dispose of her (perhaps in water), I think they would have done that. In fact, I don't think they expected to be arrested the day they let the police come to the house. I believe they truly thought they'd be collecting everything from the shed and moving it so no one would ever find her.
I think their motive was a combination of sexual desires and extreme jealousy/hatred. I think they wanted to do some horrible things to her, so while I hate to say it, I think it's better that they messed up their plan and she died earlier than later.
This entire situation is just so horrific and terribly sad. I hope that BW's family and loved ones find some kind of peace and justice when the trial is over. :rose: :rose: