Not necessarily. It's my opinion that the object of the crime was to abduct Jayme, but there's a chance that they were originally going to kill her, too, but at the last minute decided to take her. There is a chance that the perp still wanted to kill Jayme, but just didn't want to do it there. (For reasons that I am not going to speculate on publicly, but suffice to say that none of those reasons would be good.)
Yes, that's a possibility and if you're hinting at a sex crime and murder I agree. But still, wasn't the object of the crime at the Closs home to abduct Jayme? Or do you think the perps were thrill killers who took Jayme for evil purposes as an afterthought? That more or less fits my lone perp white guy sex pervert killer profile and who lives in that area. But I think he went there purposely to take Jayme and terminated the parents more from necessity than for the thrill, but in that I could be wrong. Then he's triple evil.