I think he had problems with the paperwork filing, causing part of the delay, and since the sequester, and especially with Trump's people, bureaucratic slowdowns have been immense. His injury is very difficult to get over if you want to actually run fast, because calf injuries are slow to heal sufficiently to run fast. I go slow for a long time and then only start easy progressions by feel long before I feel comfortable enough to do sprints and tempos. It can easily wreck an entire year. The tendency, as with Cheserek in the video, is to start workouts again too soon. As I said back then, he needs to be extremely conservative in coming back, and it may not be until next year that he is running fast again. They have a tendency to recur in future years, but he's still in his 20s, so he should come all the way back. A real shame, because he might have done big things this year after 3:49/7:38? indoors on consecutive days.