The descending issue is another great example of him bouncing back actually. He's no Nibali in that regard (though he held him off in Lombardia), but his descending is no longer a significant weakness of his.
And that's one of his strengths; he seems to have a willingness to work with his issues. He had an issue - which he admitted was a sort of phobia - and found a way to get past that. No, he'll never be Nibali in descending, but does he have to be?