On this Earth , however , the only man capable of challenging Bolt 's title was Justin Gatlin of Team USA .
The Flash 's Barry Allen might argue that he , and not Usain Bolt , is the fastest man alive .
On this Earth , however , the only man capable of challenging Usain Bolt 's title was Justin Gatlin of Team USA .
The Flash 's Barry Allen might argue that he , and not Usain Bolt , is the fastest man alive .