No Doubt. Djokovic emerge just because Fed and Nadal are way past their primes. They can not compete physically anymore. Roger is aging, it is a natural process where he is not able to compete 5 sets is a slow surface against a pusher anymore. Nadal is just too injured, his knees won't hold a 5 set matches against Djoko.
Murray is just not good enough. No really talented youngsters. Djokovic is in a perfect time to win CYGS.
People has to accept this. If this Djoko were playing against Prime Fed and Prime Nadal, he would not have any chances except for AO.