'Isn't even a whisper' is overstating the situation. You have a DS who was on a doping team, a team doctor from Rabobank, several teammates who had previously doped, a team that was easily strong enough to control the race from end to end (despite being comprehensively blown away in previous years) and a rider who was superstrong throughout the season at an age when riders would usually start thinking of retiring due to waning powers.
Doesn't any of that give you even the slightest concern? Obviously not, so enjoy watching the racing. I'll hold off for a few years, giving some time for rumours and any corroborating evidence to surface.