Kohl isn't quite the rags-to-riches tale we make him out to be though. Not compared to some riders who've arrived in the top 5 of the Tour without any serious stage racing pedigree at all. Kohl had at least podiumed the Dauphiné a couple of years earlier.
That's by the by though. That Kohl was doped and finished behind Evans is not evidence of Evans doping in and of itself. After all, Roy Sentjens and Steve Houanard were doping, a lot of people including some generally thought to be clean (eg Moncoutié, Fedrigo) have finished ahead of them at a variety of races.
Also, as for how Evans should have chased straight away, it should be noted that Kohl did a lot of chasing at the bottom of the mountain and paid for it later. Evans may have overestimated Kohl's pace-setting abilities based on the previous days, thinking he could rely on the Austrian for a while before taking it up himself.
That's by the by though. That Kohl was doped and finished behind Evans is not evidence of Evans doping in and of itself. After all, Roy Sentjens and Steve Houanard were doping, a lot of people including some generally thought to be clean (eg Moncoutié, Fedrigo) have finished ahead of them at a variety of races.
Also, as for how Evans should have chased straight away, it should be noted that Kohl did a lot of chasing at the bottom of the mountain and paid for it later. Evans may have overestimated Kohl's pace-setting abilities based on the previous days, thinking he could rely on the Austrian for a while before taking it up himself.