Don't you think that if Walsh found evidence or heresay about doping on Sky, he would report it? What a story to end all stories. Imagine the book sales: "How I brought down British Cycling". Because that's what it would be, so inextricably linked are Sky and British Cycling. He didn't report anything because there was nothing to report.
If he had the guts to confront someone with the power of Armstrong (at the time), he wouldn't think twice about taking on Brailsford.
And my point about Busche? Yes, I did see the race. And the reason for mentioning him was the fact that he was in the breakaway, and presumably working harder than Froome with his whole team around him, so putting 4 seconds into a (presumably tired) breakaway member and an off-colour Contador makes it less of a superhuman feat.
Some clinic members are obviously desperate to find a reason for Sky, and Froome's, success, but they're so blinkered they can't think of anything other than doping. There's no evidence, there's no positives, there's no anonymous gossip (except from uninformed people on here), and there's no superhuman results. But still, it's obvious they're doping, isn't it?