“… 7 Brian planned to kill, then killed gabby (murder)…”
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You forgot number 8, Gabby told the dirtbag she was leaving him (or at least she no longer wanted a boyfriend/girlfriend relationship…just “traveling companion”) and once he has an opportunity to have her in a remote/isolated carried out the murder. IMHO, that’s the most plausible situation given the overall situation.
One thing I heard today was that the female park police member at the traffic stop location had a long talk with Gabby counseling possibly ending the relationship at some point at a safe location.
That’s imho a variation of (7) (murder by Brian directly in person), but ya, and ya, it might be the most likely scenario given what we currently know (mane not everything at least not yet).
It would be nice to have the complete details of the coroner report (etc).
And there must be many such homicides that we never hear of in the media... for whatever reasons... :-/