If you have such a physiological edge over the competition, just amphetamines are not going to make you lose all races you enter. The dope of that era just doesn't bridge the physiological gap for many second-tier talent (all other than LeMond). EPO is a much larger bridge, multiple could get across. It doesn't make them champions at heart though, so even if they may have matched LeMond's level, he'd still beat them. Yeah, that will sound like a fanboy response, but take a step back and see it in the eyes yourself.
Me, I lost plenty of races to dopers. Was dropped off the back as well, so I surely was no LeMond. Yet, at a lower level, where I did get my little streaks of wins, I may have been ****ing off some dopers who still could not beat me. I'v seen the eyes of some of my competition after I'd won, and they were all "not normal", "WTF just happened", etc. I had a large engine, and when I got it to fire correctly, even pro's got more than they bargained for when entering a €10-for-the-winner little local race. I may have been beating some local dopers, the guys who really, really need to perform, to keep up their ego. Loud mouthes, at all the races, feeling superior to newbies, etc. Yeah, good chance I beat dopers. I just got born with a larger engine didn't soft pedal, what can they do? Perhaps they doped and made a mess of that, getting less of a boost than from legal additives. Not my problem.
I was also long unaware of doping among pro's, thought they just trained harder (I am famous for being lazy). Until when I had a really good day, I was blown away still, demoted several categories. That kind of got me thinking.
I can see how LeMond could be naive. He didn't need regular doping. EPO, posed him opposition he'd never had.