Ewan won the bunch sprint for 2nd but he could never follow Nibali's move on the Poggio. Or the moves that won the race the year before and after.
I just think the new course, coupled with smaller teams, will make it even harder again than the last 3 years to deliver a (relatively) fresh Ewan (or Gaviria, Demare, Bennett etc) to the Via Roma for a gallop. I think this year will be decided by a small (<15 riders) group, and an experienced classics rider with strong elbows and a nose for the right moves in the final 20km (like Gilbert) will be more likely to be in the front selection at the finish.