It seems everybody talks about doping improving the level of Hct and Hb, not about doping improving the level of performances.
We can control if with EPO the level of Hb and Hct can rise, this is a FACT.
We can't control if , and how much, with EPO the level of the performance can improve.
Put in your mind that, about the doping with steroids, NUMBERS show clearly their effect on the performances : not one WR in throwing after 1988, no one WR in the sprint and jump events for women after the same period, dominated by East Germany athletes (and you know also in US sprinters and throwers did not use exactly bread and water only…).
Instead, if you look at the first 100 performances all-time in long distances, in spite of antidping tests advanced compared with many years ago, and also of a higher number of OOC tests, the number of banned athletes (or because EPO was found in their urines, or because of the Biological Passport) in long distances is very little, and in several cases the banned athletes were able to run their PB after the period of ban (and during the last year of ban they were controlled OOC a lot of times):
So, we don't have any EVIDENCE about the advantages of EPO doping at top level, because we have the following categories :
1- Athletes OF SURE doped because officially banned. In this category, we can put Abraham Kiptum, Rita Jeptoo, Jemima Sumgong, Asbel Kiprop (personally I'm not sure about this case), Ruth Jebet, Mathew Kisorio (who after the ban improved of 6 minutes his PB in Marathon).
2-Athletes SUPPOSED doped. In this case, the opinion of LR posters and of the coaches of top athletes is very different, because we have suspicion about some athlete, but not connected with the performance only, that is the main reason at the origin of speculations of doping from people using their keyboard but not knowing the "ground" where athletes live and train
3- Athletes who OF SURE were clean till some period of their career, and started to look at doping when no more able to achieve the same performances. This category, that is the bigger among doped athletes, doesn't exist in the mind of LR posters, because, when some athlete 30 years old is caught, everybody supposes he already used doping when was 16.... and again the difference in the evaluation depends on the personal knowledge of the athlete.
4- Athletes who OF SURE were clean for all their athletic career, Always maintaining a high level of ethics in their behavior. In this case, coaches with the same type of ethics know very well the athletes and are sure about themselves, but of course this category can't be accepted by people thinking that without doping is not possible running fast.