He did hint at the end of the 2015 season that he may move to the 10,000 for 2016 and that it all depended on which event he thought he had a better chance of making the Olympic team.
Well he went 1500 and had a career year. Olympic team. Olympic final. U.S. Road mile champ. PR 3:34.3. Twice under 3:35. Realistically, what does he have left to accomplish at 1500? Has he peaked at 1500? Is there more room to improve or do you think he will be moving up?