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but there's no evidence of crossing that line
True, but a particularly suspicious episode cannot be disproven with any reasonable evidence either. Evidence that, by all accounts, should be easy to obtain for any team with even half decent record keeping. You keep saying "no evidence" but that is the lance defence. I say, no smoke without fire.
I've no doubt other teams are doing the same thing, other riders, but they are not partly funded by the UK taxpayer/lottery or a knight of the realm.
I think they pushed to the absolute limits of what is allowed within the rules, so using drugs that are banned in competition but not out of it, applying for TUEs when there was no real medical need, etc., but there's no evidence of crossing that line. By the rules of the sport, that means they are clean, irrespective of the ethics.
I'd argue that if you think what they were doing was in isolation, i.e. other teams weren't doing exactly the same, then you don't understand how professional sport works.