Thanks Steve, that's reassuring. Would you happen to know how much quicker (approximately) it is to descend MR than the hiking trail? I imagine the part between the final 400 towards Iceberg Lake would take a bit of time.
Over 20 years ago I did the MR approach to get to one of the rock climbs, and we descended the hiking trail. At the time I used to do my approaches in Tevas. We were running down the hiking trail and I ended up twisting my ankle pretty badly. I have a memory of sticking my foot in a stream just off the trail, some time after the twist. So that ate up the time we had saved by our previously quick descent. I remember all the people we had passed, were passing me. Nowadays I'm in hiking boots.
K