I love Krejci but he's never "made" any winger. Some here make it sound like he's been a poor-mans Mario Lemieux, turning AAAA-level players into 30-40 goal scorers.
Personally I think Krejci plays well and enjoys playing with guys who think the game at a very high level. Lucic doesn't get enough credit IMO for being a smart player because he's big and strong, but he's a smart player. Horton was basically a 25-goal, 35 assist winger the four seasons before arriving in Boston and a 3rd overall pick, broke in as an 18-year old. He was a talented player.
I think that's why Krejci and Hall look so good together. I am actually a little bit surprised as to how good a passer/playmaker Taylor Hall has become. These two think the game at close to it's highest level and are out there feeding off each other. It's been wonderful to watch to be quite honest, enjoy while we can.