It isn't plausible if you've made it up 
You don't understand Lookout. I've gone by the crime scene evidence -
Bullet casing locations.
Amount of bullets fired in this salvo.
Shot locations on body and head.
Bed attire both victims were wearing.
Likelihood both slept in their own bed every night.
Likelihood both would be asleep at 2am.
Nevill being found outside the bedroom - leaving the bedroom.