You can get off the mountain with one rope, but you miss one of the greatest raps in the lower 48 if you only have 1 rope.
IMO the extra weight of the rope is worth the ride off the top with a 100' freehanging rap with 1000' of air under you, also, some of the lower rap stations are kind of awkward with only 1 rope, but that's your choice.
We were up there 2 weeks ago and it was 90+ at 10,000 ft, no clouds and no wind, but the heat about killed us. Hope it cools some for you.
And as far a meeting "others", you'll be lucky to find any tracks of others on that mountain. Beautiful mountain, but remote.