and showboating to boot. Bolt could have run faster that day you know but I'm not sure what this has to do with the 800m.
Actually, I don't follow your logic at all. Why do incremental improvements suggest that a record is tough? Improving one's own record by small increments only suggests that the athlete is already near their potential when they start breaking WRs and it may be that Kipketer and Rudisha were similar talents.
Also, can you back up the "no shortage of talent" claim? I'm not saying it's wrong but it surprised me a little. Not to knock the 800m (I'm a fan of the distance) but it's sandwiched between the relatively more prestigious 400m sprint and the 1500m/mile so I had the impression that a lot of the would-be top talent for the distance was siphoned off by those events. For instance, has a 43.x 400m runner ever taken a serious shot at the 800m?