Keith Thurman and his return

What was seen from Thurman Saturday night that has made people believe he is back and in his prime form? I personally saw an aged shop worn fighter that did what was expected of him and nothing more. I credit Barrios for the fighter he is. He has more grit than talent and is a fun fighter to watch. I honestly picked him to beat Thurman but that's not because I think he is a world beater or future superstar but solely on the fact Thurman has been finished since the DSG fight in my eyes. Can somebody explain what I'm not seeing about Thurman at this stage in his career. I'm not seeing the Thurman of 2015 I see a shop worn fighter that gets stopped by Spence, Ugas, Bud, Ennis, Ortiz ect