Some very weird kit/gear choices going on here
Bekele is wearing a standard retail Nike singlet, not pro kit. Something like this:
http://www.runningwarehouse.com/Nike_Mens_Miler_Singlet/descpage-NMMSI.html
(the red one)
Kenny is also wearing what appears to be pro kit shorts but they seem to be from an older year as they are grey, not black like the 2014 kit. I wonder if he forgot to pack his usual race kit and had to run in the clothes he brought for his shakeout run or something.
Koech has also made an odd gear choice. He\'s running in the Nike Streak LT\'s which are generally used for track workouts and shorter road races, some pros use them up to the half-marathon but I\'ve never seen one race a full marathon in them.