Like most of us...I agree this whole kicking doors in just seems so personal...angry, vengeful...
Could be some psychopath decided: easiest way to get in is knock...they come to door, shoot them, force your entry whatever you must....
HOWEVER....
Does also suggest that this person was known...not necessarily a friend, family member or disgruntled employee - but a person from the community they would recognize....
As another poster suggested: James has chain on door...opens a fraction....the perp is angry, shouting.....things escalate with James being shot, then the door kicked in
Sometimes I think this is directed toward parents and Jayme was an afterthought...a bit of a 'oh crap' moment...now what to do....that's why they are there so long. Shooting the parents wasn't necessarily the 'plan'...and now there's this kid to deal with. Once 911 called, no more time to think: they take her and bail....
HAVING SAID THAT...lol, sigh...
Quite possible, this is someone in the community who, again, is not well known to them but they would recognize them. Someone obsessed with Jayme, someone who is having an imaginary relationship with her. Some little perceived slight or condemnation on the parents part might be enough for them to lose it....There would be no texts, emails, or any other indicator for LE to go on....
If so, though...this perp must be mentally ill to some extent...would make you wonder how independent of a life they would lead....in which case, be very difficult to keep Jayme hidden if - for instance - they had to live with parents or relatives or any other situation of assistance from others.....
Regardless I cannot help but feel that if this person was a close friend, family member, disgruntled employee, or any person who was close to the family....we'd all know by now.....maybe I am wrong there....you need evidence to charge someone....I sure hope LE has a good idea, and is working on that evidence.....but then again....if any chance Jayme is their captive: I don't think they'd be taking their time: they'd get a warrant & search....Eh...every thought: counter thought....