His 9.72 (+0.2) is his only race I find difficult to accept. It strains credibility.
I could only accept it if I considered him to be the best clean sprinter of all time, AND if I considered it to have been his perfect race.
The first, I actually have no problem with. If he proves to have been clean, I would accept that he was even better than the great Donovan Bailey, as the best clean guy ever.
The second, I actually have no problem with, except for one minor niggle--his start. The race as a whole was spectacular. He never let up, he ran all the way through the line, he showed exactly the same top-end SE form he showed on his epic relay leg, and his 30-50m was absolutely brilliant.
BUT his start wasn't perfect. He was switching well, and seemed to get out well, but relative to the other competitors, he wasn't as far ahead as is decidedly possible for him. OTOH, it is maybe BECAUSE of that lesser start that he was able to maintain his SE in this race.
But to be fair, there were some mighty good starters in that race, like Collins, Carter, and tricky Dick who can sometimes have a good first 30m, as he did in this race.
The race was beautiful. If there is one guy I could believe to have done this--to have gotten lucky and run the perfect race at the peak of his fitness--it would be Powell, given his longevity and his consistency.