There is no end to the "ridiculous suspicions" of LR posters.
You don't know any rule, but want to speak, and this fact makes of you full stupid persons.
In all the Major Marathon, such as during the top Championships (Olympics and WCh), officials of the Team (or, in case of not institutional competitions, of the management) can give personally to the athletes their bottle, with the idea of avoiding problems during any refreshment. Also yesterday, for example, there was one refreshment (I don't remember when, I think at 25k) when almost Kenenisa had an impact with Wilson, since he saw his bottle on the table only last minute, and crossed the road suddenly, with big risk for himself and Wilson. So, nothing strange in this : maybe more strange that the most part of top runners don't have some official of their management doing the same, but of course not many responsible of managements can follow the races (because the organizers don't pay tickets and accommodation for more than 2-3 persons, apart the athlete, if the athlete himself is not the defending Champion, or Olympic Champion, or World Champion.
And, because Global Communication is the management with more top athletes in the World at the moment (Kipchoge winning London and Olympics, Kenenisa who.... is Kenenisa, Abel Kirui twice WChampion and silver Olympic medal, Geoffrey Kamworor World Champion of Cross Country and Half Marathon, plus Florence Kiplagat WR holder of 15k, 20k and HM), you can see, also in the future, many times Jos on the ground with his athletes, since he has the PASSION for following, and not the will to go there because wants to appear in TV.
About the refreshment, I want to explain that normally everybody uses maltodextrines in different concentration, depending on the km. This is something used by triathletes and cyclists too, and can represent a new source of energy about 10 minutes after your drink.
So, there is no reason to have a drink at 40 km, for having new energy, but Kenenisa used water only, because the psychological effect of feeling more hydrated can help the athlete to find new energies in his mind, and consequentely in his body.