Kenyans distance men side have fallen into marathon training abyss. Those who are not injured or burned out, run well. As is, their best marathoner has 3000/5000 capability and something close to 3:50 mile PB.
Ethiopia recognizes the need for speed side development and thus trains more intelligently for 5000/10000 success. Less fixated on volume as a panacea, and thus able to push more quality.
Ironically, the Kenyan 1500/3000 runners are more in tune with the requirements.
Kenya is all about the marathon and marathon training, which is why they rule the road.