He's played a couple of games, showed a decent cross with the right in the couple occasions, decent dribbling, which is mostly based on his DS and ACC, and nothing more than that. Against Ludogorets he really didn't do almost anything.. He's still not 100% fit but he seems kinda raw with the ball, perhaps he's lost a bit of his old agility. And I am not sure if we should keep Incisive Run anymore but we'll see. There is just one example of it in Lanus&Palmeiras highlights, it seems that he's changed his old style of play. https://www.youtube.com/watch?v=hrVucLu-vTA https://www.youtube.com/watch?v=mM6qJYy1Mww
From what I've seen, there is no way that he could replace Katai properly one day. Mouche isn't a game changer, tbh they are a totally different players and a different calibers.
btw he's played 5 games for argentina in 2011. and scored 2 goals vs venezuela, but the team was made of a home league players.