Which actor in Friday Night Lights has matured the most?

Episode 6 season 4 of "Friday Night Lights" is somewhat quiet compared with many others, a transitional point in the middle of this season of episodes - the E. Dillon Lions begin to come into their own as a team, playing a heartening game and proud in defeat. Strangely, none of the players have fully emerged the way the players did on the Dillon Panthers in previous seasons, but there are tremendous plot opportunities in the racial tensions on the team, an issue rarely explored in previous seasons - the racial tensions regarding Smash Williams resided largely off the field. This episode more about people leaving Dillon, Lyla (Mrs. Derek Jeter) comes back for a brief turn with Riggins - I do think she's one of the weakest actors in the show - and then she's back to college leaving Riggins morose. I think she's out of his life for good, or ought to be - he's a guy destined for nothing good, I'm afraid. In parallel plot line, Matt takes off in his beat-up old car - there's nothing left in Dillon for him, now that his grandmother doesn't need him and all he's doing is delivering pizzas - except for Julie, but he knows she'll go off to college, too. Very sad moment, and very true to life, as so much is in this series. Landry increasingly emerging as a very good character, his dialogue with Matt as they toss around a football, after the funeral, just great - smart and thoughtful and boyishly awkward and true. Not sure what range the actor has, but seems to me he could potentially be a very good actor in a bigger part, especially with some comic possibilities. He's grown and matured as an actor more than any other in the series.