Of a handful of five best friends, it is unlikely that all will eventually succeed together.
Looking at my hand, and then considering myself the thumb and my very best business friend as the index finger, followed by business friend 2 the middle finger, the ring and lastly the pinkie business friend. Whatever the combination/social group, the group of us got to be hell lucky for all five to be successful.
Add in another handful of five fingers of friends and perhaps your toes too. With twenty friends in the sample, it is highly unlikely that merely only one or two will fail, ie 18 succeeds. Not possible. Statistically, many more friends have to take one for the team each by falling.