This wasn't the primary point of the thread, so I didn't spend all that much time on it in the OP, but I do think some of the more conspiratorial posters are refusing what is obvious after a moment's thought: Sawe submitting himself to extra testing really *is* evidence in the direction of his being clean. (Evidence, not proof!)
We've seen that testing really can catch dopers. Not all of them, not on every test, but dopers get regularly caught, including big names, enough that if you're doping, exposing yourself to a bunch of extra tests is a pretty reckless thing to do. If nothing else, you have to be that much more careful timing the dosages, that little bit more restrained while peaking for a major race. And if you think Sawe is doping with some new drug that can 100% beat the tests, why didn't Chepngetich take that drug? Why haven't all the recent Kenyan drug busts taken it? Why wouldn't a doper want to take that drug AND a little EPO, which will definitely show up on the AIU tests? Why choose the AIU in the first place, given that they have the reputation of being less corruptable than other testing agencies? And just because a drug may currently be undetectable doesn't mean there won't be a test in the future. Just why sign up for the hassle and risk when you don't need to?
And I'll just reiterate that Sawe barely seems to even benefit from all this increased testing. It doesn't seem to be tied to big contract bonuses or sponsor opportunities. Other, bigger names have eschewed this sort of scrutiny, so it's not like it's required or anything. The general public won't ever care, and even if they do hear about it, they'll just remember "Sawe, something something, doping".
I think in other areas, this line of reasoning would be obvious. Maybe the mafia are cheating on their taxes, maybe they know they can get away with it. Doesn't mean they'll voluntarily sign up for extra audits with potentially hostile IRS agents, that's just pointless. Maybe the student cheating on their exam is so slick they could sit in the front row and get away with it, but will they? Or will they sit towards the back where their cheating is easier and less risky? Etc. etc.
Look, we can never have proof that any runner is clean. I and others have claimed that this is evidence, not proof. But for those of you who will never believe an elite runner is clean, you're positing an extra level of narcissistic sociopathy for Sawe to willingly sign up for this and yet dope. Unfortunately, these traits aren't alien to elite sport. But the question remains: it the hypothetical scenario where Sawe is doping, why did he sign up for this? What would he even gain from the exercise other than a cartoon-villain-like satisfaction from foiling the heroes.