Briguy, how much time do you think doping is worth in the marathon? I don't have a good answer for that, but obviously if Kipchoge is doping, it's not taking him from being a 2:09 guy to a 2:01 guy. At a certain point, if someone is SO much better than everyone else in their event, it makes an argument for them being clean because they don't need to dope to beat everyone. I'm not suggesting this is the case, but to what degree doping can impact performance matters for this argument.