Hi there! Just my opinion below & crime profiling. I'm still not sold that an accomplice isn't involved other than husband. But MOO.
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Motive: Personal & Professional Jealousy
IMO...You have a possible perp where LE is aware of the home bc of possible past domestic violence issues where police were called out; wife might have been the aggressor. Husband is former military & self-defense expert. Wife likely has above knowledge capabilities in self-defense & combat, too. Missy was fit & tough, but female perp was likely skilled enough to surprise attack and drop to the ground.
Background: Wife makes all the money working 9 years as a budget analyst at an aviation company. She's smart & successful with an MBA. She leaves her job one year ago & 3 months later becomes pregnant. So now you have a tsunami of things occurring: loss of major income and your 4th child on the way. She starts doing Mary Kay, another likely stressor, bc now two parents rely on unsteady income.
Right before pregnancy, daughter falls from the home stairwell balcony and suffers a broken jaw & brain injuries and is in ICU. She ultimately survives but requires longer hospital stay. More stressors.
Mom gets pregnant. During pregnancy, she posts selfies constantly and speaks about losing weight as soon as the baby arrives. She seems determined. She talks about getting in shape and going to the gym. When baby arrives, she's soon all about losing weight. But as the months move into February, she's not going to the gym as much nor losing the weight.
Soon her husband finds a great new job with a vibrant woman as a partner in the next town over. This woman is also a mom & wife and also runs her own business and seems to be loved by everyone. She's fit, bubbly and outgoing. Her husband and MB are working a lot and just all about helping other people with their goals! So mom and dad split time with the kids, but dad's new job requires him to do many classes early and late.
Missy is just like CT in her eyes. Missy's also a mom & runs her own business...And she's successful, healthy and fit. And everyone admires her. Even CT's husband. She can't take it anymore. The rage & jealousy builds. An emotional affair derives in her mind. Since she's smarter than all of us, in her eyes, perp thinks she can get away with it. She knows the ends and outs of that location, surveillance cams, when Missy will arrive, when campers will arrive & it won't be suspicious to be out early in the morning bc that's when she usually works out anyway.
April 16-17 Missy & AJ are heading to Austin for a work event.
One day before, April 15, a creepy message arrives to Missy on LinkedIn by unknown person.
April 18 - Missy is murdered with wounds to her head and chest, meaning the perp likely sat on top of her so she could see her eyes.
Husband never knows.
All of this JMO & my amateur profiling. I loved to hear others and any ideas!