Frankly, one of the things that turned me towards JD's side was a casual comment by some friend of his in an interview.
The friend said it was not unusual during Johnny and Amber's marriage for them to invite Johnny to come to their house for dinner one night, and then "the next thing you know, he's still there two weeks later, sleeping over in my guest bedroom".
Not only did this seem retrospectively reminiscent of the kind of thing I've heard prior, from/about domestic abuse victims spending as little time possible in their homes with their abuser; it also carried with it such specificity that I thought "this has to be true. The average person who randomly throws around some lie or another on the spur of the moment to cover up for someone, is only going to be able to grab at a conventional dull lie. People generally aren't that creative about giving alibis."