Wouldn't surprise me to see Froome getting partially dropped / gapped on 1 or 2 of the mountain stages this year - the Giro / TdF double is a huge ask, but overall his consistency and experience will be too much for the others IMHO.
Saying that, I was just looking at the profile of the time trial penultimate stage and that is one hilly customer (also short-ish at 30K). Very favourable for the less powerful testers like Quintana, Bardet, Yates etc. So that's another thing Froome (and Domoulin) will have to deal with, he can't rely on burying these guys in the TT like he normally would.
Froome has proven to be great on longer climbs, poor on short ones. Probably why he's never bothered with LBL.