I like Greene. He was very attentive to details, although encumbered with a bumbling deputy who seemed to need elementary training in starting and enforcing a log about who entered a crime scene. Greene noticed and provided first documentation of the tire marks, bullet casings, footprints at corner of shed (based on a deputy’s report to him), holes in the back of the feed shed window, and various other important elements of the scene. And he secured Alex’s shotgun and was asking the right initial questions of Alex. (ETA: And he did all that in less time than the 21 minutes that AM visited his sleeping mother that night.)
I’d elect him to replace several of the officers who arrived later and started tromping all over the scene, lifting the sheet over PM, etc. and doing nothing to keep parties OTHER than LE distanced from the scene.