I think all the folks on the DP that are apologists and anti-Lemond assume blood doping HAD to be prevalent in the 1980's because of Moser and Los Angeles '84 Olympic team.
But blood doping with their own blood had limited advantage. Without EPO to boost, they lose much advantage for training, and they cannot store multiple bags without the preservatives as the expiry is about 60 days. You try taking out 3 bags worth in 60 days before the end of a Giro, then replace them, and see how you do. I reckon they could hardly train if they took out that much blood, and without EPO one bag's worth will never be replenished completely in that 60.
Obviously it helps.
But I think what they missed, is EPO enabled blood transfusions also. They went hand in hand.