So from what I read, jbr had a couple blood spots in her underwear, but she did not have matching blood spots on the skin next to it, because presumably the skin had been wiped down. Also police said that due to her injuries, she should have had a lot more blood in her underwear. So that means the underwear was new and put on after the injuries and after she was wiped down.
Okay, how did she get blood spots in her underwear, after she was wiped down? I guess they wiped her down, put the new underwear on, and then took them down again to check, saw two blood spots on the skin, cleaned them, and then put the underwear back up. The previous blood stains still being on the underwear.
Also there was saliva DNA on the underwear but touch DNA on her fingernails and on the long johns waistband.
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Hmmm. Well it could be this. Whoever wiped her down, used an old paper napkin out of the trash. Maybe it was left over from the party. Or it could be the napkin that they got from their Subway sandwich delivery etc. That had some random person's saliva on it.
This was the final wipe down, when they did that final wipe down on the skin next to the underwear stains. This person's gloves, on the tip of the fingers, picked up some of the DNA on the napkin, and got some saliva when they pull the underwear back up, and got some touch DNA on jbr's fingernails while he was moving her hands and pulling up her long johns, in the final move.
I think that could work.