Nibali came back at Sammy Sanchez when he was descending well, another great bike handler. Best I ever saw was Salvodelli, absolutely amazing, he seemded to be able to push way beyond what most people would dare, incredible confidence and ability. And if you are not a particularly good climber, being tidy downhill can be very useful, and make DS's happy when you can be ready for a bit more work!
Bouhanni is a bit, er, erratic. He's getting a reputation which will not do him any favours, a bit like a ceertain Mr Abdu from a while ago. Mind, he could crash all alone without any help whatsoever!