Some random thoughts or mainly questions having slept on it:
The car: No one will remember if they saw a car at that location during those hours on that day two years ago, especially not without a description. If LE knows there was a car there they would know kind of what it looked like, so why wouldn't they mention it? And if they don't know what it looked like, how do they know it was there? What was the point of mentioning the car?
The audio: Why didn't they release that before? Surely they don't think BG is the only person in the world who says "guys." Seemed like a pointless update to me, but I'm sure it wasn't. How could it be relevant?
The video: Yeah, look at him moving, but don't take note of his limp, that is because the bridge is difficult to walk on. Seems equally pointless as the added audio that adds nothing new, and you'd think they could have released from the beginning. Why show it if we're not to take note of his gait?
The sketch: Was a game-changer for sure. Where does it come from? How do they know he doesn't have a beard and looks scruffy anymore? How do they know he might appear younger than his age? ???????
The message to BG: Lots of religious references, talk about conscience and shame, calling him a coward. It was very specific imo. Did BG leave something at the scene that makes them think he's this kind of person?
I feel this whole news conference was for the killer, from how they announced it in advance inviting the public, his emotional behaviour and the way he was looking around the room, mention of the car that the public unlikely can remember, the choice of words. Etc.
I'm 50/50 on if they actually know who it is, or if it's just a new tactic to lure him out using what they know. It was certainly the strangest news conference I've ever watched.