Realistically this has to be a primarily GPM-oriented break. Pretty much all of them are specialist climbers and only really Martin and O'Connor will have any real GC aims at this stage. I know Poels is fairly close but he's also the one who's done the most points-collecting suggesting he's already ahead of the game on targeting the KOM, and getting back into the GC mix as part of that will just be bonus for him. Quintana and Higuita were two I isolated as likely GPM-hunters after yesterday, while Woods is a strong climber who's also accumulated a good amount of points already. Barguil is an ex-GPM winner too, but has been a lot more anonymous lately.
Edit: Poels just holds on! Good battle there.