Bryan's wisdom lives on even after his death.
As someone who has led a ride or two over the years, I differ a little on his view on the Leader being in staggered formation.
As a ride leader, your mind is constantly working on navigation, checking the group, reading the road, and riding your own ride.
To safely do so, you need to have a little space from the peleton.
I believe a ride leader needs to have at least double the distance between the other riders - at least 8 seconds.
This allows them enough recovery time if they just miss a turn, etc.
Also, riding up front can get very boring - so sometimes you ride left of lane and sometimes you ride right of lane.
If I ride no 2 and the leader changes lane sides, I don't change.
If you ride in the group and a rider overtakes, they leave a gap in the peleton.
That doesn't mean that everyone now has to start changing sides like a military formation.
It just means there is a missing rider position somewhere - ready to be filled by another overtaking rider?
Lets use our heads on this issue.
If you are 2 seconds or less behind the rider directly in front of you, you need to be in staggered formation to ride safely..
If you are 4 seconds or more behind the rider directly in front of you, you need not be in staggered formation - unless you want to be.
The sweep has similar concentration and boredom issues.
When I ride sweep, I tend to drop back ten seconds or more behind the next rider.
That gives me ample riding space to ride a little faster in spurts if I wish, to ride left or right of lane if I wish, while still maintaining my station.
As a sweep, I never get closer than 4 seconds to the next rider.
That's the way I like to ride my own ride.