We had a BRD drop group after the second boss (because he couldn't avoid the aoe's) in Dzemael Darkhold. I was leveling up my DRG at the time and we had a whm and war that was left in the party. I believe the tank was fairly new to the dungeon so I was explaining the encounters. So the 3 of us ran the rest of the instance ourselves.

Got to the last boss and we down him in one shot and the other 2 both gave me their comms.

I don't always give my comms to the tank (if I'm on my drg) it usually goes to who ever was the friendliest and communicated the best. I've been in runs where only 1 person has said anything while the others were silent for the whole run, that single person that spoke (if it was not mean) usually got my comm.