Rjm33, not rekrunner, but you are wrong again.
The studies you showed above were absolutely useless, and of course made without the contribution of any expert of methodology.
a) The "elite" for the researchers are very far from any category of real "elite".
For researchers, if the Marathon World includes 200,000 runners between the WR and who jogs 6 hours, "elite" are runners able to run "under 2:40". This is a big mistake, since if we want to really study some phenomen, we need to limit the research to "omogeneous subjects". This means that if we want to discover what happens in the body of top Marathon runners, we need to study subjects under 2:06, since 2:10 already can't be considered "elite" (till now, 828 athletes were able to run under 2:10 !).
To consider "elite" athletes of 2:30 >< 2:40 means also that there is no clue about their training, very much "soft" as volume and intensity than the training of the real elite.
I don't have any doubt EPO can help athletes with this type of "soft" training to increase their performances, but this happens because these athletes are not helped enough by their own training.
b) Every research is made with subjects normally living and training at sea level, going altitude only for 40 days (first research) or 20 days (second research). Also an idiot understand that this category has nothing to do with athletes "born, living and training in altitude", since their normal condition is exactly the opposite of the condition of the subjects chosen for the research.
c) If somebody thinks that altitude can produce some increase in VO2 max, is somebody who really doesn't have any clue about training. In 1995, Saltin and Terrados went Kenya for testing, among other factors, the VO2 max of some of the best athletes. In the Group there was also Anders Garderud, Swedish Olympic Champion for steeple in 1976, and organizer of Stockholm meeting where Peter Koech bettered the WR of Henry Rono.
When they met Peter Koech (already no longer a runner in the last 3 years), Garderud was not able to recognize him, being 30 kg heavier than when beated the WR. In this conditions, Peter achieved the higher VO2 max Saltin and Terrados ever could see, clearly showing the influence of training on VO2 max is practically very limited (don't forget Derek Clayton, first man running Marathon under 2:10, had a VO2 max of 69 only).
d) It's obvious that the most part of researchers want to use some test following the usual protocols, but can't obtain different results, till when the subjects are Always amateurs or joggers at disposal of the researchers.
Different is THE RESEARCHERS ARE AT DISPOSAL OF TOP ATHLETES since this means TO FOLLOW THEIR TRAINING FOR CONTROLLING THE CHANGES IN THEIR VALUES INDUCTED BY THE TRAINING ITSELF.
In other words, NEVER there was some research about the effects of training, and all the data you can produce are total bullshits, if applied to the omogeneous category of top athletes born, living and training in altitude.
The conclusions of the researchers are, sometimes, so obvious for coaches working at top level, that we don't understand the reason of some useless research. For example,
"Although total O(2) carrying capacity was improved, the mechanism(s) to explain the lack of proportionate increase in V(O)(2max) were not identified",
means that the researchers supposed a relation between the carrying capacity of O2 and the increase in VO2 max, that, how I explained above, doesn't exist.
The reality is that, till now, there were scientists studying oranges but thinking the final data were good for apples, and the most part of posters in LR, including you, continue to do the mistake to apply the studies for one category of subjects to another, more limited, category of subjects.
Yes, all are human beings, but their attitude are not at the same level, and the modifications inducted by their training (which is very much different) make them different subjects, when we speak about specific attitudes, and specific reaction to external stimuli.
For using your words, "nothing to see here".