The biggest and best arguments are against the 9.7x club, and then you can extrapolate from there as you so wish. The sub 9.8 club has DOCUMENTED (to address khorrps) evidence to stake a claim that none of them are legit. To a certain degree, you can maybe make some good arguments for a few guys in the 9.8s, but I was specifically making a distinction between 9.8s in general and 9.9x basic. I mean, you can be peaked out as a 9.9x basic guy and I you run a perfect race and run at altitude and get a perfect wind, then next think you know you're getting into the low 9.8s. Even a 9.99 guys could theoretically go to El Paso and end up with a 9.84 wind legal. I'm still a fan of the whole basic thing. I mean, even some (or many?) of the low grade 9.7x guys are simply mid to low 9.8 guys in basic.
The one guy here mentioned Beamon as how an outlier can exist outside the PED era to possibly explain a clean Bolt. Beamon's famous jump was, of course, in Mexico City at altitude. Beamon's mark is a legit moment and performance, but there is a context to it. Know what else happened at those Mexico City games? Hines went 9.95 for the first "official" sub 10. If you were to go with Sprintgeezers style of assertion (and I'd bet he's kind of representative of many people's feeling on the subject), Calvin Smith's 9.93 in '83 is one of the last supposed "indisputably clean" 100m Dash world records, and it was only .02 better than Hines, and done 15 years AFTER (and also run at altitude). One could could claim that the Hines 9.95 stands up very similarly to Beamon, which puts some of that outlier effect of Beamon's performance in even MORE context. The altitude and moment in Mexico bred ouliers.
The general 9.8x number shouldn't really be considered impossible in and of itself. In basic, though? I dunno, maybe.
As for Lemaitre or however you spell his damn name, did he even ever do a full on sub 10 basic? I don't like him because for as talented as he was, he never really panned out. I don't care if the reality is the last clean guy was Calvin Smith and Lemaitre, himself, was also clean. Lemiatre isn't in the running under any version of the truth of being the fastest ever. And I don't think anyone is really even making that claim, either. The thing about Lemaitre is from his 9.92, people were expecting sting him to go down from there, and that never happened. I'm glad he ran what he ran just to shut up the "white people can run sub 10" bologna, but it's not like he's that big a deal as a 100 guy. Hell, even as a 200 guy he's regrettable because....really shouldn't he have achieved more?
As for Bolt. Man, I dunno. You can think what you want, of course. But...for me the math will never add up.