kinda semi plot hole that all participate are strangers to eachother. If any premade group showed up they would absolutely dominate (like the MC's group for example) it would take literally ages for them to betray eachother.
@blossom Yes and no. For example, the girl with the headband said that she had a group but they decided not to enter as a group because this is a Heart challenge. So this leaves you with loners, first-timers or people who have found groups but want to avoid these type of tests. But you are totally correct that if our group would have gotten into this challenge they would have come victorious or at least lasted till the end.