He was saying that the advantage goes to the prosecutor since they have the last word and can go on and on for hours and hours and hours to convince the jury pool while Trump team only had an hour + or so in their closing arguments! Turley was making the comparison between the advantage and disadvantage in being last to score points against your opponent. So I took it as if there is one jury member who is sitting on the fence the prosecutor being last has the advantage to persuade him/her.
Overall, your post was a lot more negative about Trump’s chances than Turley’s, but having the last word does work to a certain extent for Bragg. It’s possible for Bragg to get a conviction. Nobody knows exactly what will happen.