slim charles said:
He believed every year, why do you think he's suddenly scared? Fear is not the reason he's going for the Giro, that is ridiculous thing to suggest.
Not really. You could call it fear or being smart and maximizing his career.
I always felt that this is something Nibali has done his entire career.
2009 - did the Tour and was beaten, which is natural since he was young.
2010 - did the Giro and manage to win the Vuelta with some luck (Anton crashing out).
2011 - did the Giro/Vuelta again. Finished second behind Scarponi in the Giro was 7:th at the Vuelta.
2012 - had a crack at the Tour but was easily beaten by Froome and Wiggins
2013 - went back to the Giro and won
2014 - had another try and the Tour and won it convincingly after major luck with both Froome and Contador crashing out.
2015 - Came back as defending champion and didn't do well (as a defending champion, a stage + 4:th place is not good)
So to me, it seems to be a clear pattern of him continuously improving and targeting races that would maximize his results given his current level. Testing the Tour in 2009 and 2012 and both times he found himself unable to compete with the best so he went back the the Giro/Vuelta and them came back to the Tour again after additional improvement as we saw last year. Some would call it fear, I call it being smart.