In reply to smithaldo:
Regarding the big boots thing.
We set off mid afternoon hoping to get to the foot of the snow crest by nightfall, spend a few hours cooking/resting and set off up the snow once it started to freeze.
We climbed the lower half of the rock in big boots before it went dark and had to spend about 10 hours shivering our b*ll*cks off without sleeping bags before we could continue next morning.
We switched to rock shoes next day for the second half of the rock buttress and found it way faster and easier than the previous day, despite having to carry the extra weight of big boots.
On other routes, I've always found wearing rock shoes much faster and easier than boots and have even worn them on the occasional, more difficult, via ferrata when we seem to romp past everybody else in big boots.
FWIW I thought the lower rock buttress of the Frendo was Severe, certainly no more than HS and I was only climbing HVS at the time. The Rognon is much harder I believe.