You seem to have forgotten this when you wrote:
“The streak of non African winners continues
A non-African born runner winning a Marathon Major until the last year was a really rare occurrence, especially if we excluded Russian winners (state sponsored doping program). In fact, it hadn’t occurred this decade. Now in the last three Abbott World Marathon Majors we’ve had at least one non-African winner in each race (Galen Rupp in Chicago, Shalane Flanagan in New York and Linden and Kawauchi in Boston). We expect the altitude born athletes to start reasserting their dominance at London this year.”