Thomas has shown that he's pretty good in cold, rainy weather (if he stays on his bike), that could help him a bit in the Giro.GT confirmed for the Giro, it really is a no brainer, 70km of TT should pretty much guarantee him a podium if he can maintain last years tour form and doesn't crash out.
I have no belief that he can beat Remco or Roglic without a bit of luck, but who else would finish above him of likely starters?