its evident but most likely its just down to motivation. Its ridiculous to think that exactly one team is doping and all other wont do it. Thats just plane stupid. If they are doping, than surely all teams, that can compete with them do it as well. That would mean, that almost all cl-round-of-16 teams, were/are doping. Considering that there are smaller sides, that are actually running more would imply that these teams are also doing.
Its the same logic, when people think/thought that ONLY the tour de france winner was doping, while #2-#100 have to be clean (else they would have also won
).
Its down to: Almost all teams do it. Almost no team does it. Individual players do it.