Why not?
Lance was not freezing his own blood. He was not using other people's blood. He was not using artificial hemoglobin. He was not using HGH during his Tour run. He was not on the cornucopia of drugs that riders on teams like Liberty Seguros and Kelme were on. I don't think there is any question that Lance was using a subset of the drugs and doping techniques being used by other riders. This matches Dr. Ferrari's philosophy of using the minimum necessary of what actually works. When Floyd had his program dialed it came down to a couple of units of blood for the race and EPO with an anabolic during training. That is certainly less than what was being used by riders on Spanish teams.
After 1999, Armstrong also had the luxury of focusing on the Tour and the confidence plus track record that he could win it. No other rider was in that position except possibly Ullrich. Everyone else needed to hedge their bets. While Lance could use just the doping needed for the Tour, other riders had to go full rtard for other races in addition to the Tour. Hamilton is a great example; he was top fueled for the Ardennes, the Giro, the Tour, the Vuelta, the Olympics. When Armstrong had basically hung up his bike after the TdF, his rivals were trying to save their seasons at the Vuelta or the world championships, and doing that while fully jacked.