Sorry to bring up an old thread but saw no need to start a new one.
I have been listening to a Glen Mills interview. They are discussing 2008. Basically the reason they began to do 100’s and train for 100 speed was because Glen noted that Usain was not fast enough and that he had to blow it all out at the beginning of the 200 in order to keep up and that is why he got 2nd in the 2007 200m final. So…he says they specifically worked to increase Bolt’s speed and worked on his 100 early in the year, the result being he broke the 100m WR in 3 races. Mills says they worked to peak TWO times in 2008 - the first one in May/June then the second at the Olympics.