Pure speculation here, but it doesn't seem so far fetched when you think about it. German is taking a stab at a longer distance here. He has had achilles issues for years now when he has tried to push the speed for 1500-5000 training. He was able to run the times he did off of rather limited training due to his massive aerobic engine. 2016, a typical contract year, is rapidly approaching.
I wonder if he isn't at least considering the marathon trials. Right now, his options for making an Olympic team on the track look rather limited (not saying he doesn't have the talent, but he would need to stay healthy and train well to compete with Rupp/Hill/True/Jenkins/etc. at 5000m). If this race goes well, why not tempo a half marathon this fall to get the qualifier?
The training would be easier on his achilles, and although no one knows what his potential is at the marathon, why not give it a shot? Progress has been a little limited on the track these past few years.
Anyway, sorry to detract from the thread, I predict Chelanga wins, with Ritz close behind in second.