One would think it rather pointless to resist DNA requests by LE. It would not take much to get a Judge to order that. So, resisting would only serve to make someone seem obstructionist. But I think it's really interesting that LE asked for it of certain people.
Then as far as CR wanting to get into LS's pants, that probably would not be surprising to LS. I would be very surprised if she were not hit on every day and especially in these types of social situations. It would seem human nature that she would enjoy the attention - to a point, and that he would keep her entertained and hoping for a moment when she might let her guard down. And isn't this how it is from puberty, through college, in bar scenes and even in a lot of religious environments when you are young and single.
Young women are both enjoying the attention, avoiding the creeps, looking for a partner or better partner or pretty much as often as men, or at times just going with the moment. What runs through my mind is that she had to be somewhat used to this sort of thing, and perhaps had strategies to deal with it. I would want to know from her friends, how did LS normally handle these situations? Everyone has habits(that's how humans function) and patterns and we should know hers, as well as all of the POI's. Then you get a clearer picture of what situations were most likely to occur and what the response would be. For example, let's say CR just flat out told LS to come to his place but she was trying to figure out a way out of it but for whatever reason was wasted and had a hard time doing so. Then very plausible another salivating hyena is there at smallwood before she can get to her apt. How rational she be at this point? She operates on instinct... let's go to XX's place... but she's in and out of consciousness. And XX's are not responding. CR, keeps coaxing her to come home with him. She stuck... can't go home, no one answers the door, don't want to wind up with CR... but then blam! face down lights out, purse and keys gone (except her keycard and fake ID which JR later says she had) Then minutes later she's on CR's back. Then inside of his apt. Yeah, I think it's her who vomits on the rug. And then she helps MB put CR to bed? nah... more like CR puts her into his bed. Got stains in that bed, stains on the floor, maybe some dna samples for that stuff? But so many people in and out... lots of dna there. Maybe something if you could prove LS's vomit and LS's blood. Or that she was in that bed (but wait LS said she helped CR to bed so of course her DNA is there... hmmm) So, is he a loser and rapes her as she's passed out? This is not unheard of... and it comes more under that gray area of date rape than rape because with all of the drinking and such, it's hard to prove whether or not it's consentual. So, like most of the other scenarios what happens next is she dies. Now what? Would JR help in this situation? Let's say he would because, JR supplied the coke or other drug that got her so messed up such that she died. The fact that CR may have taken advantage of that situation may not have been known to JR. For example... CR ejaculates by 3:15 and realizes that shes not breathing. He tries some CPR and it's not doing anything... He puts her clothes on, which may have mostly still been on and yells for MB. MB may not have realized what CR did and is now simply freaked out that she's dead. So JR & X come over and take her to JR's etc... Most of this plays out the same except she could have been raped by CR and no one else would know (and of course CR cant remember if he raped her or not)
Ultimately this probably does come down to the gritty underside of human nature. Some guys just wanted to have sex with her, most wanted to get high/wasted/totally messed up, someone wanted to profit. Follow the money, follow the dope, follow the testosterone. All 3 trails were involved, which leads to her demise? Or rather which can be ruled out? So far, none of them.