Well I don't always do this either and just last week got thrown a loop. I have never had a buddy suddenly have ear issues at 65ffw. Our communication wasn't very clear, I normally stagger a descent like this with maybe 2ft vertical seperation but still close enough to see everyone. Someone has to lead by at least a little afterall because you're right "formation" is somewhat artificial and doesn't actually work at a site with current etc.
I was leading our group of 3, someone new was #2 and I didn't realize #3 had to stop and was 20ft above where I couldn't see her (on a recreational fun dive). Vis was about 8-10ft. Got to the bottom, thumbed it. Came up to #3, waited for her to clear, redescended.
Guess my point is the communication on ascent/descent skills are there to use them - even when they seem "unnecessary". Would have been better on my part with a new person to be in tighter formation.