Sorry, I'm not of your opinion.
To suppose all people are the same, is for me a great mistake.
Physiological principles are the same, like mechanical principle are the same, but what can change the performances of a car Fiat 500 doesn't work for a Red Bull or a Ferrari Formula one, because ALREADY these car include the most advanced particulars.
One question : why not all people can have the same performances, also using the same training ?
Can you understand that there are different levels of qualities and specific attitudes, and because of it the reaction is strictly individual and cant be homologated (I don't know if it's a correct word, it means considered the same for everybody) ?
Also the reaction to some therapy when people are sick is not the same. Why Lance was able to defeat his cancer, while 99% of other people with the same problem go to die ?
I learnt that, in training, we have the principle of "individualization", also if physiological principles don't change. The same happens in the science of medicine.
If pharmacs can work at the same way for everybody, why doctors have to change many times their prescriptions, using some pharmac different from the first one they gave, because it didn't have any effect ?
If medicine is an exact science, why when some very important person (for example, some President of a big Nation, or the Pope, or very rich people) has a great desease, there is a pannel of different doctors discussing together for offering different solutions to the same problems ?
I think you follow too much what is written in scientific books, where you can find one thesis and its opposite.
But something must be clear :
1. Top athletes don't have the same physiological behavior of normal people. They are top because already have some physiological, morphological and mental difference from normal people. In addition, they train very much more than normal people, and very much better ; they have more control than normal people about recovering and resting ; their motivation is fed by the advantages they can have through their performances, that normal people cant have.
So, this is a type of population absolutely specific, and every research done with normal people presents very little bearing with their situation.
2. NEVER there was a specific research looking at this specific group of champions. All researches look at groups of normal people, divided in categories very much general : for example, sedentary men Vs. runners 3 times per week for 30' easy Vs. runners 6 times per week for 1 hr a little bit faster.
I remember a study about marathon, some year ago, considering "homogeneous group" runners with PB between 2:18:00 and 2:45:00 in marathon. For me, homogeneous can be a group of "under 2:05:00", already different from a group between 2:05:00 and 2:07:00. When we speak about the tops, every research must be very refined, and a deviation of 5%, statistically accepted, in our case goes to disprove the results.
3. At the end of every thing, I fully confirm what I wrote several times : till when we don't do a SPECIFIC RESEARCH with SPECIFIC TOP ATHLETES of SPECIFIC DISCIPLINES acting in SPECIFIC EVENTS, we don't have any proof about what can happen using some substance.
About steroids, athletic records clearly speak : no records in throwing, and in events where muscle strength is very important (sprint, hurdles, jumps for women and in some case for men too), after 1988, when antidoping started to work better and IAAF became stronger under this point of view.
About blood doping, we see that, also if the antidoping system improves every day, athletes continue to better records, of course when there is good race organisation (without rabbits, practically it's impossible to better any record, apart Rudisha).
And some argument used by who believes everybody is doped is frankly ridiculous and pathetic : for instance the fact nobody is able to run again, after 2004, events of 1500 / 3000 / 5000 / 10000 / steeple at the same speed is explained with the improvement in the quality of antidoping control (so, these athletes before could use EPO without being caught, today it's no longer possible), but at the same time Marathon can improve a lot because of EPO.
But, of course, the most part of people don't have the education to use their brain, and are slaves of every kind of propaganda.
And don't forget the Big Pharma is the 3rd business in the World, and the Companies spend a lot of money for exerting undue influence over the population of every Country, which is the greater source of profit for themselves.