I first want to say welcome, even though I am just as new as you are. I have been following this case passively since the very beginning, receiving tid bits from my wife. Once the hoax sighting in KC took place, I latched on and have been on WS for a few days now. This is a great site, everyone provides great insight and it is run in a very professional manner. Not to mention, everyone is so nice on here.
Now, down to brass tacks...I echo your opinion. I think this scenario connects a lot of things for me. This could be the reason LE is so tight lipped, because they DO HAVE a large piece of key information. This could have been some sort of communication between MT and this person in an electronic fashion, whether it was welcomed or not by MT, ie a facebook message or direct message via other SM sites. The second thing I want to note is that she didn't necessarily have to get into a vehicle "willingly" or because she was "comfortable" with this person. Someone a few threads back mentioned the Dru Sjodin case in which a knife sheath was found. Or even the Jacob Wetterling case to a certain extent. In this case it could have been a gun or some other sort of weapon, obviously the use of a weapon can be very persuasive, but we just don't have the evidence to show it at this point. This leads me to believe that the reason LE pushed back the PC is because they are close to something. I have said already that if they had nothing new to say, they would have just had the press conference. My final thought is a little further speculation with not a ton of basis to go on, but I feel like this person was organized, somewhat local and familiar with the area. This is where I really echo your idea, it isn't a coincidence that they knew she was alone. I don't think it was someone young because if that person was also missing, it would have come out by now. It is quite obvious that MT was a caring person, who may have connected with someone via a church function or something around town out of the kindness of her heart and this person took it and ran with it. It could have been someone from a neighboring town that frequents Brooklyn for work or some other reason. I think if it were random, it is too clean. There would have been more to go off of. MOO. (Yes, I am catching on the acronyms)
Again, a lot of speculation on my part, love the site and I look forward to the thoughts everyone else has.
Fantastic post and a belated Welcome! Seems really well thought out. Unlike what I'll post below as some notes on my impressions thinking out loud, off all you sleuthers great posts.
For me, the things that stands out the most, now that we know much more about Mollie, considering we have a better idea since yesterday the loop she may have taken on her jog, is how well planned this may have been.
The perp may know Brooklyn very well and how not be noticed, especially at night.
The perp may have struck with either intrusive or natural awareness of her habits, thus able to create or take advantage of a window in time when Mollie would not be missed.
If that is true, then why go through all this trouble to end her life?
I think the trigger for this may have been the feeling of losing her or access to Mollie, or not having a chance with her after the wedding trip.
The perps sense of owning Mollie by whatever lurking habits they had may have been extremely challenged by the idea of her flying away and returning committed, so a plan may have formed over time, was maybe even tested. Like she ran into this person before on her jogs, maybe chatted in a friendly way.
A well planned perp would perhaps not leave her initial reaction to chance.
Did Mollie ever say she ran into an unexpected acquaintance during her jogs?
If this is true, then the perp may have resources, may be very technically adept at covering their internet tracks, as Otto mentioned, an IT pro on some level, who can make it seem she did homework that night, sent a snap chat, planned distractions, able to cover their tracks online.
If this is true, then the time window that was taken advantage of was in part to confuse the search and get away.
If any of this is true, could it being summer and the perp not being noticed in any way mean they too are on summer vacation, thought to be away?
Sorry for the mess above, just wanted to get it down, it is probably all wrong.