Okay, I took a week off. Now I see some interesting posts, for example about this 15 minute trip, I see the regurgitating of old subjects, for example the "stolen" hyoid bone and of course, openly turning biased suspicions into facts.
So, where to start? Hyoid bone? Maddalenasgirl: The hyoid bone is one of the rare bones, not directly connected to other bones. There are two more, but they are inside the head and therefore often fall inside the skull when decomposition progresses. However, the hyoid bone lies open and therefore is often missing on unwrapped skeletal remains. So it's nothing unusual in fact. But those bones are not "stolen" to cover up something, they are just carried away by little animals.
Put the thing for a moment under a logic test: There is a dead body before decomposition. Means, there is tissue around and the hyoid bone is still connected by tendons. No way, someone would get it out without cutting and that is not that easy, especially without leaving tool marks. Tool marks from a removal would be pretty obvious, and nobody, also not SCPD would label the case an accident anymore. Thus, the time, when the hyoid bone disappeared, had to be AFTER decomposition progressed far enough, means, when the tendon connections were gone. So unless, you want to relive the theory, the killer kept SG in his basement and waited for her decomposition, the idea of stealing said bone right after death to "cover-up" a murder is off the table.
Next one? Turning biased guesses into facts: Adler, I beg you, don't write "evidence, SG didn't slip out of her skinny jeans" in a list of facts. It doesn't make it look as if such evidence exists, which it doesn't. I mean, the only thing, we actually know is, she slipped earlier on her own INTO that jeans. So she had also the ability to slip out herself, which is by the way a lot easier than to get a girl out of them if she doesn't want.
On a side note: Keep in mind, paradoxical undressing occurs even without additional drug influence in about 1/3 to 1/2 of all hypothermia cases. Add drugs and you end up ignoring the statistically more likely solution. So in the end, all we know (temperature mostly, the area wet, even not entirely flooded), points rather out, she probably did slip out of her clothes herself.
The 15 minute gap? I think, 15 minutes can bring one pretty far away from Oak Beach, but that would be a mathematical misconception because they had also to come back in that time and deal with what- or whomever they had to deal. Which means, the actual distance can't be more than 7 driving minutes and probably less, because they had to do whatever business brought them on this little excursion. So we talk rather like 5 minutes driving or less. And still, we don't talk about farther away than just the next two houses around, because in that case, it would have been easier to just walk over there, especially when we assume, this was about to get more drugs. Cars in the night usually drag more attention than just two persons walking around. So technically, we are back to mathematics, in this case geometry. Because we search for some place, which is farther away than maybe 5 minutes walking (inner radius) and maximal 7 minutes driving away (outer radius) without leaving Oak Beach. As far as I see it, there is no way to leave Oak Beach with a car without passing that gate, but maybe someone with better eyes can have a look at that?