In my experience, it depends on the attorney. Some know everything down to the last comma. Some rely on their team.
In this case, I feel like since all of the posts, etc were so important to all 3 experts, it would have been important for the attorney to review it all as much as the experts did. Maybe he did. Maybe he just couldn’t get over Who Does This, and really believed the jury was just going to say yeah, but she got shot.
In so many ways, he kind of was handed a crap case. The police gave him nothing beyond “this guy says that guy did it.” And they failed to do simple stuff like search the other vehicles. Then you have the victims he had. And the Stache. Best he could hope for was a plea. And when that didn’t happen he gave it the old college try.
I wonder, if he had any kind of autonomy and no boss/voters to answer to, would he have started out with lesser charges? Offered a more enticing plea? He knew the case was crap. But he has a boss. Who may or may not be an elected official (I sincerely don’t know).