Armstronglivs, what you say is ok, eccept the fact you continue to speak about "doping" in general way. I think that already I explained my ideas about "doping", and I never said it doesn't work : all what I say is about EPO.
The only thing we know about EPO is that, due to the ability to transport more oxygen, the recovery from fatigue becomes shorter. This is a fundamental factor in cyclism, during the big competitions with 20 stages in following days (Tour de France, Giro d'Italia, Vuelta de Espana), but is not a factor in athletics, where the ratio between number of training sessions and number of competitions is 1/100, or maximum 1/50 (100 training sessions for one competition, in the case of Marathon, sometimes, 300 training sessions for one race).
In this "panorama", athletes can decide when are ready for the next tough session, increasing the modulation between intensity and recovery looking at individual characteristics, and absolutely is not true that who is able to recover in shorter time can be also able to have the training sessions with more quality.
Therefore, the acclarated fact that EPO can help the recovery doesn't produce any variations of the final performance, if athletes are trained according their natural characteristics.
Also, it seems everybody forget that the percentage of athletes doped with blood manipulations (including EPO and BP) is less than 15% of the total, while the percentage of athletes doped with steroids is of 65% and the percentage of athletes banned for missed tests of whereabout mistakes is about 10%.
What I cant accept is that doped athletes, at very high level, in the general vision, can show that also who is not "officially" positive MUST be positive, because it's not possible that doped and not doped athletes can achieve equivalent results.
At first, there is a difference of individual talent. When we speak of Kenenisa, of Shaheen, of Haile, of Tirunesh Dibaba, of Beatrice Chepkoech, or, in other events, of Usain Bolt, or Edwin Moses, we speak of "freak of nature", who absolutely didn't need any external help for being, at their best, at the top of the world.
Secondly, there is a big difference depending on the training system. Several times we had athletes (especially Africans) wo are already of high international level, in spite of a very poor coaching and the lack of physiotherapic supports. These athletes, when finally approach a professional and well organised situation, including training camps (they finally can eat twice per day) and coaches of international level, can produce big jumps of quality (for example, 2:07 in Marathon can become 2:03, or 3'33" in 1500m can become something better than 3'30").
Compare long distances with sprint. The real money is in the sprint events : there are more opportunity to compete, are still in DL (long distances are cancelled), there are higher contracts from the Companies, there is more interest from the TV, and generally every top athlete has a very high medical support, something that doesn't happen with middle distances, where the best are Kenyan, Ethiopian and Ugandan. So said, how is that in top 100 of 100m almost 50% of the athletes had some problem with doping, while in marathon only 3 had problems (in spite of the fact that at the moment the athletes more tested are specialists of long distances, in order to have data enough for creating their Biological Passport) ? Really do you think African athletes are clever, and able to evade every control, and rich American sprinters are idiots who don't know what have to do for appearing clean ?
The problem is not that I don't know the limitation of doping : the problem is that people believing in doping as main reason of any performance don't knopw the limitation of training.
So, I give you reason, but also I reverse your argument. You ask "what is the logical argument for banning EPO if altitude training works better ?". The logical argument is that very few athletes, excluding who lives in altitude because born in altitude, decide to move their life from their place to altitude (maybe in different Country), so continue to train at sea level, and in this case EPO works, giving the same effect (maybe in shorter time) of Altitude. For that reason, EPO must be banned, and who uses EPO must be banned, but this doesn't mean that taking EPO in altitude, if there is proper training, can produce the summation of the two effects.
And, again I point out, NEVER there was some research with top athletes living and training in altitude, giving them EPO for controlling the final results.
Therefore, my conclusions depends on what I see and I know (facts), the conclusions that EPO gives advantage also for top athletes living and training in altitude depends on what researchers see, but don't know, refusing to investigate clean athletes for understanding the physiological effects of proper training.