How many other professional bike racers were doping in the Lance Armstrong era?

If most or all the other bicyclists were also doping, then was there was a level playing field? Many others were caught at the time. I remember Jan Ullrich getting caught and for a while, he was Lance’s biggest challenger.

But if Lance forced his team to dope, then maybe other team leaders were doing the same thing with their teams. Doping seems like it was rampant.

If it was, then Lance won when competing on a level playing field. The only reason they went after him so hard was that he won. Do they go after the cyclists who didn’t win as hard? Is there any incentive to do so?

Let’s say only half the bicyclists were doping. Or a quarter. Or three quarters. What does that say about the fairness of the competition?

If everyone does it, then presumably the outcome would have been the same if no one had been doing it. Or is that an unreasonable assumption?