Speed endurance the key to *all* 11/12second sprinters?

The year that Dwain Chambers broke the World Junior record running 10.06 (run at end of July) he started his season with a 10.96 (I think run in early May). Now this was way down on his then previous best of 10.41. After he broke the record I spoke to his then coach and asked him how the hell did he get him down to that sort of time from the base he started the season. He told me that Dwain had started doing weights seriously that Winter and had yet to ‘absorb’ the effects!