Rewatched the match today and while he was the best outfield player on the pitch I still think he's got some room to improve, still quite a few moments when he shoots when he should pass, and quite a few times he just doesn't make a run other players are expecting or doesn't attack the back post and he could pick up a lot of goals that way.
His partnership with KDB is great. Delph was trying to stick to KDB all game, but the two of them worked together really well to get Mahrez past Digne and force Delph to abandon KDB to cover.