You love to see that natural enthusiasm for the game that EK has. Another guy who seems to have it is Drew Doughty.
NFL teams increasingly use the, "How much does he really love the game?" measuring stick when evaluating draft prospects. It was even the title of Jon Gruden's book - "How Much Do You Love Football?" They found over the years that there are a lot of ridiculously talented athletes who, at the end of the day, just didn't have the passion for the game needed. They played football because they were good at it and it got them things they liked - social status, money - but the fire just didn't burn for them. On the other end of the scale, Peyton Manning is apparently a complete football nerd - compulsively studying film, first one in, last one out, etc., even at age 37. Needless to say, that's what you want.
It actually makes sense, and strikes me as one of the most important intangibles any pro sports team should look at with prospects. Any guys who ever played sports at a competitive level will know that "talented with no passion" guy - he teased you with his skill level, but at the end of the day you couldn't rely on him. You also know the guys on your team who just loved the game, and had that good attitude that was infectious.