What follows below is conjecture based on approved sources and experience ALL MOO
Increasing odds are the car is not local. This isn't based on lack of an occupant contacting LE, who may have a valid reason to not wish to, but rather several other reasons; first it's easier to start local with registrations and video and then work outwards, lack of progress to date leads one to think the initial net came up empty. Secondly, a local vehicle would likely have already led to tipsters to contact LE. As a hypothetical example, let's say the vehicle was used as a mobile drug pickup, which certainly would give the owner a reason not to contact LE, chances are however someone would have the same local 'hookup'. Victim cell records would also likely rule out such scenarios.
There is a chance it is associated with someone at the 'Christ Church' or someone who left with it for UI Fall Recess (which imho is a significant event we haven't focused on) but it seems in LE would have investigated those possibilities.
From various previously linked sources and PRs we know LE has much more information than they have released. This includes important facts such as: likely sequence and locations of the attacks, any attack signatures, existence and status of door locks including those of downstairs roommates, mobile and other communication to and from victims, prior incidents victims may have been involved in, information/alibis related to the most obvious suspects, deliveries to the house, extensive victim backgrounds, and any physical or evidence or lack thereof to date.
So, any crime theories by those outside of LE are at an immense disadvantage.
We do however know that even with all the information LE has, they are asking from public, information related to the occupant/s of the white Elantra, and information related to the location of X and E throughout the evening.
