The only problem is that NOBODY of the athletes in Dubai could run London, because David Bedford was not interested. London this year accepts 6 kenyans only, and few Ethiopians, and of course other athletes (Kenyan and Ethiopian) of good level, but not yet with top times, cant go London paying ticket and accommodation by themselves. You must understand that, in the professional World of top runners, where last year there were 150 athletes under 2:10, somebody having performances slower than that time needs to look at second level Marathon. It's not a case that, among the top 10 men, there are 4 athletes managed by Gianni Demadonna and 5 of Global, and only one from another manager (Geneti from Mark Wetmore), and in the ladies 5 from Gianni, 2 from Makke Hussein and 2 of Global, plus Isabelle Andersson (Swedish Kenyan). This because these two management had particular links with Dubai (Gebrselassie won 3 times, and last year Barmasai that is from Global, while the ladies of Gianni already were 1-2 last year). And don't forget for Ethiopians was one particular opportunity for trying to have one of the 3 times they need for going to Olympics.
However, I knew very well the possibility of the athletes I follow directly in Kenya (Jonathan Maiyo, Lucy Kabuu, Lydia Cheromei) and through the programs I give to Gemedu Degefu in Ethiopia (Dino Sefer, Dawit Shami, Chimsa, Seboka Tola, Aselefech Mergia, Aberu Kebede and Koren Yal). Globally, 9 PB from my group, and the only surprise was the level of the performances, because I waited something slower of 1:00 / 1:30.
Dubai was like Berlin last year : same wonderful conditions, and to be lucky with the weather is the first step when you run a marathon.
But don't be too much surprised. Look what can happen on 15 of April (Rotterdam, Paris, Vienna) and in London, and you can understand that really something changed in the marathon.
And, about doping, it's curious that somebody takes as example in the past there were drugs the fact that the performances on track during the last 5 years went down BECAUSE NOW THE ANTIDOPING CAN WORK BETTER THAN IN THE PAST, but at the same time a new drug can work for marathon runners only....