I don't have any connection with Katir, and never met him in my life. But I can't accept the widespread idea that, because his origin is maroccan (we know there was a problem of doping there), his Country is Spain (also Spain had some doping problem in the past), automatically he must be doped "for association".
For my experience, what he did can be ABSOLUTELY POSSIBLE in clean way, with the right talent and the right training. I don't know anything about his training, and can't evaluate his talent only watching in TV his races, but if this can't give me the certainty that he is clean, this lack of elements can't make me suspect he "must" be doped, because his improvement and his performances.
About the researches sponsored and ordered by WADA, the problem is that all those researchers don't know anything about athletics and training. They THINK to know, but NEVER had the will, the opportunity or the interest to STUDY the effects of training.
When we see that athletes having the level of Hct at 39.7 and 52.5 can achieve the SAME result in the SAME event (and these are REAL data about some of the best in the world), we can't give too much importance to that data. An easy fact to think : Hct is the product of the number of eritrocytes (RBC) per their volume (MCV). This means that an athlete can have 45 of Hct because has 4,500 RBC with MCV 100, or because has 5,500 RBC with MCV 82. Do you really think that those 2 types of Hct can have the same effect, and works in the same way in the body ?
And if some athlete can win WCh in steeple with 39.7 of Hct (Kenyan male), or Olympic marathon (always with 39.7), when some other can run 3'32" with a value of 52.5, WHERE IS THE OTHER FACTOR THAT CAN COMPENSATE THE DIFFERENCE ?
Nobody deny the fact that the assumption of EPO can increase the ability to transport Oxygen. The question is : Are we sure this is a fundamental factor for improving performances, or there is something else, maybe connected with the physiological variations provoked by hard and proper training in regime of hypoxia. that are absolutely individual ?
Why, for example, after almost 3 months of training in altitude with Chinese Team in Duoba (2400m) before the Asian Games 2014, when I had the possibility to do basic blood tests EVERY WEEK for controlling the development of many values (including MCV, PLT, cortisol and testosterone), the athletes that improved a lot in 800m (from 2'07" till 1'59"48) and 5000/10000m (15'12" and 31'53" from 15'55" and 33'08") COMPETED WITH LEVELS OF HB AND HCT LOWER THAN BEFORE GOING IN ALTITUDE, while other athletes showing a big improvemnt of their values were not able to better their PB ?
Too many situations there are in the REAL training, that researchers don't consider, and don't want to study, because maybe too much complicated and/or expensive, remaining at the end in the same protocols, with the same low level of subjects, only for writing some article that has the only result to create fake ideas in everybody who doesn't follow in professional way the top athletes in their discipline.