Fuglsang lost time instead of gaining, so his chances are very small as well. Majka and Pozzovivo can be dark horses but their TTing is not that good so they need to be the strongest on climbs.Joao Almeida or Wilco Kelderman. Depending on the cancellations and the race going all the way or not. Fuglsang may have a chance too if he uses the hills of week 2 well. Nibali's chances are stages 18 and 20 without cancellations/shortenings.
Voted for Kelderman, but that was before the positive cases for multiple riders.