My thoughts run in this direction:
He either didn't dope and won (no positives, remember?)
He DID do it and did it better and beat em at their own game
Either way, he beat em.
...but he's been retired for how long now? 'Course, since he's back into racing Tri-s, I can sorta-kinda see keeping the investigation going. Kinda sorta. Ya also gotta remember he was kicking ass in tri-s at 16! If he was doping at 16, I'll be really, really surprised.
I'm a cyclist that rides motos, not a moto rider that rides bicycles.