Until LE fills in the timeline for us or the entire chain of events emerges in a prosecution (who knows when/if that will happen), we're stuck with discrepancies, gaps, and limited information.
So since the information stopped flowing, my direction's one of reviewing what's known, weeding out what would make no sense given the known and verified timeline, and asking why.
Ultimately, I think this is a case of 'it's simple but not easy' to deduce where she might be and how she got there. That is, I think the who/how/where/why will likely prove to be relatively straightforward, but the dynamics that led to the outcome will be complicated.
So for now, my questions revolve around why, because simply characterizing it as a potential revenge motive doesn't explain a thing about why that morning/day, how, where, and why she's been so difficult to locate.
Motive specifics to me are what leads to the rest, particularly if more than one person is involved. This is what I meant by my remark that you really have to willing to make some sacrifices to abduct a person and end their life. And since I don't think anyone involved "snapped" or is a serial killer who doesn't perceive risks or sacrifices, I think someone took some really big risks here. And, since she hasn't been found yet, I think there was some planning about where.
Why is that? What threat did HE pose that was perceived greater than the risk it took to lure her (IMO that's what happened), isolate her, cause her disappearance and what's likely her death, and take her to where she's thus far been hard to find?
Part of the not so easily discerned details of the social history and dynamics and perceived threat, most likely. JMO