>. The training and gains he made while doping didn't go away when he stopped (like Rapp said).

The article Rapp posted was based on use of anabolic steroids, and even then it was speculative, not definitive. Colom took EPO (well, he may have taken other things, but he definitely took EPO).

According to this article from Velonews, stopping EPO usage does is very bad for high dosage use and undetermined for microdosing. (Colom likely microdosed given the state of EPO testing at the time).

But it seems unlikely that EPO effects go from very bad following cessation of a high dose to indefinitely performance enhancing following cessation of low dosage. It's more likely that the bad effects are just proportional to dosage in some way. But I could be wrong...sometimes nature acts in funny ways.