I personally believe Indurain took EPO but the question is when did he start?
He progressed slowly rather than in sudden leaps and won smaller stage races before becoming a Tour contender, it was a mountain stage he also won in 89 and he finished 17th that year at 25yo.
I think Indurain could have won the Tour in 1990 if he had been Banesto team leader instead of Delgado, he finished ahead of Lemond in all the vital stages(including all individual TTs) and it was only the stage to Alpe d'Huez where he lost a shedload of time after dragging the break of Delgado, LeMond & Bugno to the foot of the Alpe, he then lost so much time(10min +) it would seem like he actually cruised up Alpe d'huez.
If Indurain was on EPO then, what was his team leader Delgado on because he sure wasnt the rider he had been the previous few years. Surely the domestique wouldnt be on better stuff than the team leader unless you believe the Conconi project angle. Personally I dont because there has never been a whisper about it, kinda like the LeMond doped theory.
I think Indurain might have won without EPO in 91 but after that I am not so sure. I know that seems illogical but that TT in Luxembourg 92 where he destroyed the field was unbelievable, he beat Fignon by over 6 minutes after which Fignon decribed Indurain as an "Extra-terrestial", I think that is a telling comment with the benefit of hindsight.
Obviously, pre-Festina, not as many questions were asked about doping and especially as Indurain was such a nice guy. He gave away so many stage victories in Giro and Tour so fellow riders really respected. He really was the anti-Lance. Some thought he was boring but give me the silent type over the media ***** anyday.
As a side-note on Reynolds/Banesto/Caisse, I remember Andy Hampsten mentioning in an interview that he was put under pressure to dope at a team late on his career, so that would be either Banesto 95 or US Postal 96. I know Eddie B was chief of Postal at the time, but would Hampsten have felt pressure to dope for the American circuit. I doubt it so and it would seem more likely Banesto is the team he refers to, as he didnt make their Tour team in 95.