Can Usain Bolt hold off his predecessor?

Four years ago at this time in Beijing Usain Bolt burst onto the scene and became a household name. This year, Bolt's training partner and fellow countrymen Yohan Blake hopes to do the same. Usain is still the favorite to win the races, becasuse of his name, the same way Phelps is still favored to win no matter how many times Lochte beats him. Like Phelps, a younger, and possibly better version of Usain Bolt is on his way up. Yohan Blake shocked Bolt at the World Championships and beat him in the 200 and 100 Meter races. Bolt, like Phelps over Lochte was heavily favored. 2012 is different from 2008 in more ways then just technology and the newest inventions of Apple, it is possibly the dethroning of the kings of their respective sports. Bolt, 29 is succeptible and nervous, as his kyrptonite seems to be his training partner at only 22, Yohan Blake. Is it already time to see a changing of the guard in track and swimming? Or do the elite owners of their title as 'worlds best' have one more run in them? Move over Lebron vs. Kobe and Mike Trout vs. Bryace Harper, it is time for Phelps vs. Locthe and Bolt vs. Blake..get ready!