The Ashenden "microdosing" program beats a 2 unit reinfusion for increase in Hb-mass.
I think you are referring to this
, which was discussed here before.
Twice weekly IV injections of EPO for twelve weeks raised Hb to levels about the same as (not more than) two bags of blood, and did not trigger any passport flags. I can’t access the entire article any more (the above link provides just the first two pages), nor find my posts discussing this article earlier, but IIRC, the doses of EPO used in this study could be detected by the EPO test during periods of this regims. So not a perfectly safe method. OTOH, Ashenden has also shown that transfusions can likewise beat the passport. So (autologous) transfusions, for which of course there is still no approved test unlike EPO, still appear to be safer.
They did not. They used the BB's on top of the EPO-boost.
Probably some riders do, and as I noted before, EPO is needed to counteract the suppression of retics.
Edit: This illustrates why it would really be helpful if DD came clean. Was he transfusing and using EPO both, and if so, was he using a schedule given to him by someone else? What does he know about how other riders are blood doping? Even without naming others, he could potentially provide some useful information.