You guys are seeing ghosts.
How does it work at these tracks in Ethiopia (or in Kenya)? Does Mo get to call ahead and reserve the track for two hours while he does private workouts exclusively with the group he's "training with"?
I've seen pictures of tracks in Kenya and there are hundreds of local hopefuls who run together with elites.
I bet it's really not unusual for other unassociated athletes to be training on the same track at the same time.