We should not.Your ranking is very different to mine. Even despite your bias, I am surprised you rank roglic so highly. Can we really consider him more of a favourite in such a long, punchy race than piddock, Ciccone or Heally, for instance?
The only caveat I have for Roglic is that he comes in more prepared than ever for a race like this, but that's about it. This sort of high attrition race does not normally suit him. Roglic is an outsider for the podium, and if he get 20th or worse it's not that much of a surprise.
For me the top candidates for 2nd are Pidcock, Ciccone and Healy.