Don't judge a book by its cover - Mark and Margo
I assumed they would be an insufferable and entitled couple of boomers, but they've proven themselves a lovely pair. They were introduced brother and sister in law who didn't get along with zero in common, I assumed they would spend the entire series on each other's nerves. Instead they've perfectly balanced each other out, each has taken time to indulge in the other's interests.
They're in really good health for their age. They don't look or move like people I know in their 60s. Did Mark say he still plays football with 20 year olds a few episodes ago?
They've spent the least time (zero time from what I remember) stressing about the race. They lost a day to illness, a few half days here and there to rest and sightsee and yet they're still in the middle of the pack. If they tryharded as much as the other teams they would be 2 days clear probably. Surely that makes them the best racers of the bunch