I'm speculating motive not to satisfy curiosity but to understand who all is actually involved. It may be that SG is only part of the picture and thus only one of the suspects. Based on the motive, different individuals may be involved. JMO.
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Agreed. I have been thinking of a scenario involving multiple individuals -both related and unrelated to SG- conspiring together to accomplish a very specific purpose, which may explain the number and types of agencies involved, why LE are taking their time and the extreme lack of information released about the investigation.
I also agree with what you said in another post: "I think once it all comes out, there will be a shock or surprise." Maybe the investigators learned something very early on that they decided to keep close to the vest -very close, though I do believe they have shared with Danielle's mom and dad but no one else- at least until there is an arrest. Even if there is an arrest, it may be a while before the public learns the whole story, depending upon how forthcoming and cooperative the first suspect arrested is and how much evidence there is against others. It may just be that LE thinks SG is the weakest link -it's not like he is a hardened criminal-, thus practically outing him as a person of interest, hoping that he will crack under pressure.
Personally, -based on what has been reported via MSM- I do believe SG played a key role in what happened to Danielle on the day she disappeared. I also believe it is entirely possible that this was all done by him, other than maybe another individual helping him after the fact, either knowingly or unknowingly. I go back and forth. Whatever the case, I hope someone comes forward with Danielle's whereabouts - soon.
ETA: I've always been suspicious of the notion that Danielle and SG were romantically involved. I do think that they were "acquaintances" -term used by LE-, as in they worked in the same building, and especially with the nature of SG's job, it is reasonable to speculate they would at least recognize each other. With enough insistence, he might have been able to talk her into taking him home, but that's it.