I was in that race also....as was Andy Wacker (13:40 5km guy, 1:04 half).
We got destroyed. Max was climbing really well and nailed the technical descent around mile 14 (it was gnarly). Killian didn't pull away for the win until the final 5km or so (uphill climb on a somewhat rocky trail).
After Everest I honestly didn't think Killian would have the wheels for the first half of the race (more fireroad stuff)....he proved us wrong. I've always lost to him by quite a bit...granted they have always been "mountain races." (aka "The Rut 50km").
Mont blanc 42km had nearly 10,000' of climbing.
Andy pushed the pace early on with some of the downhills...we probably were hitting 4:40-4:50/mile velocity there downhill and Killian was moving really well on the "runnable stuff."
The first big climb starts off with about a 20% uphill grade....after that it is like 15% grade for nearly mile. He is very good at that (more mountain trail climbing) and even better at the technical descents.