If the elite women are doping today, using better and more sophisticated drugs than were around in the 70/80's (Oral turinabol vs epo, hgh etc) you'd have expected that due to faster track technology at the very least, that someone would have broken Marita's 400m time by now. However no one is getting ANYWHERE near it and imo it will still probably stand in 2115 as well. Given that at any given time the elite athletes are all 'on a level playing field', so to speak, it's quite possible to say that over 400m Marita was a once in x generations athlete.
For Dafne's 21.63 the wind speed was tailwind +0.2. Jones' 21.62 was set at altitude with a headwind of +0.60. Flo-Jo's 21.34 was with a tailwind of +1.3.
Factor in the wind speed and Jones' altitude 21.62 is quite clearly quicker than Flo's 21.34. (Wind speed differential of 1.9). Dafne's 21.63 compared to Flo's has a differential of 1.1 which puts Dafne extremely close to the WR.
On a clearly quicker track than 1988 it's not too hard to believe that a power sprinter from a heptathlon background and bags of mental strength has produced a 21.63 (as the cycling sprinter Mark Cavendish so aptly often says "the winner of a sprint isn't the guy who goes the quickest, but the guy who slows down the least"). From around 150m the Jamaican started to slow a fraction, Dafne however kept it going and overhauled her in the last few metres only.
And btw, acne or not, Dafne is absolutely gorgeous.