KB has been back from injury for over a year, you can no longer say he is rounding into shape anymore. In fact, he was on a steady decline before his injury, he has only run fast once or twice since 2007, albeit he was still winning races prior to his injury.
Confidence plays a major role in athletics, when the king loses his crown, sometimes he can put it back on, but it never fits the same. I saw this with Mike Tyson when he was humiliated by Buster Douglas in Japan. Iron Mike was never the same and the era and aurora of invincibility is gone.
In 2007, KB went into the belly on the beast in Mombasa Kenya at the IAAF World XC Championships. This event to the Kenyans and Ethiopians was bigger than the Olympics and the Superbowl combined...for both countries this is their national sport against their biggest rivals on their home continent and KB got humiliated and was never the same since. Also, being a millionaire with a wife and child probably didn't help either.